Rinstrum 400 Series User manual

400 Series
(K401, K402, K491)
Digital Indicator
Reference Manual
RI00-600-130

Copyright
All Rights Reserved. No part of this document may be
copied, reproduced, republished, uploaded, posted,
transmitted, distributed, stored in or introduced into a
retrieval system in any form, or by any means (electronic,
mechanical, photocopying, recording or otherwise)
whatsoever without prior written permission of Rinstrum
Pty Ltd.
Disclaimer
Rinstrum Pty Ltd reserves the right to make changes to
the products contained in this manual in order to improve
design,
performance or reliability.
The information in this manual is believed to be accurate
in all respects at the time of publication, but is subject to
change without notice. Rinstrum Pty Ltd assumes no
responsibility for any errors or omissions and disclaims
responsibility for any consequences resulting from the use
of the information provided herein.

Reference Manual Rev 2.30
004R-600-230 Page 1
Table of Contents
1. INTRODUCTION ................................................................................................................... 6
1.1. Overview .................................................................................................................... 6
1.2. Document Conventions .............................................................................................. 6
2. SPECIFICATIONS ................................................................................................................. 8
3. INSTALLATION .................................................................................................................... 9
3.1. Introduction ................................................................................................................ 9
3.2. General Warnings ...................................................................................................... 9
3.3. Electrical Safety .......................................................................................................... 9
3.4. Cleaning ..................................................................................................................... 9
3.5. Panel Mount Template ............................................................................................... 9
3.6. Cable Connections ..................................................................................................... 9
3.7. DC Power (DC PWR + , DC PWR –) ....................................................................... 10
3.8. Load Cell Connection ............................................................................................... 10
3.8.1. Load Cell Signals and Scale Build ............................................................ 10
3.8.2. 4-Wire Connection .................................................................................... 10
3.8.3. 6-Wire Connection .................................................................................... 11
3.9. Auxiliary Connections ............................................................................................... 11
3.9.1. RS-232 Serial ........................................................................................... 12
3.9.2. RS-485 Serial ........................................................................................... 14
3.10. Optical Communications ........................................................................................... 15
3.11. Connecting Shields................................................................................................... 16
3.11.1. Cable Shield Connection and Earthing ..................................................... 17
3.12. Regulatory Sealing Requirements ............................................................................ 17
3.13. Accessory Module connection .................................................................................. 18
4. SETUP MENUS ................................................................................................................... 19
4.1. Accessing Setup Menus ........................................................................................... 19
4.1.1. Setup Display Prompts ............................................................................. 20
4.2. Exiting Full or Safe Setup ......................................................................................... 20
4.3. Menu Navigation ...................................................................................................... 20
4.4. Changing Data ......................................................................................................... 21
4.5. Numeric Entry ........................................................................................................... 21
4.6. Selections and Options ............................................................................................. 22
4.7. Strings ...................................................................................................................... 22
4.7.1. Normal String Editing ................................................................................ 22
4.7.2. Numerical String Editing ........................................................................... 23
4.7.3. ASCII String Editing .................................................................................. 23
4.8. IP Addresses ............................................................................................................ 23
5. BASIC OPERATION ........................................................................................................... 24
5.1. User Interface Display and Controls ......................................................................... 24
5.1.1. Overview .................................................................................................. 24
5.1.2. Display ..................................................................................................... 25
5.1.3. Primary Annunciators ............................................................................... 25
5.1.4. Keypad ..................................................................................................... 26
5.2. Operation Keys ......................................................................................................... 27
5.2.1. Power Key ................................................................................................ 27
5.2.2. Zero Key ................................................................................................... 28
5.2.3. Tare Key ................................................................................................... 28
5.2.4. Gross/Net Key .......................................................................................... 30
5.2.5. Function Keys ........................................................................................... 30
5.2.6. Up, Down, OK keys: Products (K402 and K491 only) ............................... 31
5.2.7. Clock ........................................................................................................ 33
5.2.8. View ......................................................................................................... 34
5.2.9. Report ...................................................................................................... 34
5.2.10. Total ......................................................................................................... 35
5.2.11. User ID ..................................................................................................... 35
5.2.12. Target ....................................................................................................... 36
5.2.13. Lock .......................................................................................................... 36
5.2.14. Alibi .......................................................................................................... 37

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5.2.15. Acc ........................................................................................................... 38
5.2.16. Stability Considerations ............................................................................ 38
6. CONFIGURATION............................................................................................................... 39
6.1. General Setup Information ........................................................................................ 39
6.2. Correct Loadcell Selection ........................................................................................ 39
6.3. Filtering Techniques ................................................................................................. 39
6.4. Industrial vs Trade Modes ........................................................................................ 40
6.5. Calibration Counter................................................................................................... 40
6.6. Passcodes ................................................................................................................ 40
6.6.1. Full Setup Passcode ................................................................................. 40
6.6.2. Safe Setup Passcode ............................................................................... 41
6.6.3. Operator Passcode ................................................................................... 41
6.6.4. Setup Lock-Out......................................................................................... 41
7. SETUP MENUS ................................................................................................................... 42
7.1. GEN.OPT (General options) ..................................................................................... 42
7.1.1. LANG (Operator language) ....................................................................... 42
7.1.2. P.T.SCP (Preset Tare Scope) (K402 and K491 only) ............................... 42
7.1.3. DATE.F (Date format) ............................................................................... 42
7.1.4. PCODE (Security passcodes) ................................................................... 43
7.1.5. KEY.LOC (Key Function Access Control) ................................................. 43
7.1.6. DISP (Display options) .............................................................................. 44
7.1.7. ID.NAME (User Defined Strings) .............................................................. 44
7.1.8. USR.NUM (User Defined Numbers) ......................................................... 45
7.1.9. POWER (Power options) .......................................................................... 45
7.1.10. STR.EDT (String Edit Mode) ..................................................................... 46
7.1.11. USR.DEF (Set all non-calibration settings to defaults) .............................. 46
7.2. H.WARE (Hardware Configuration & Test) ............................................................... 47
7.2.1. LC.HW ...................................................................................................... 47
7.2.2. SER1.HW, SER2.HW ............................................................................... 48
7.2.3. ETH.HW ................................................................................................... 49
7.2.4. IO.HW ...................................................................................................... 50
7.2.5. ANL.HW ................................................................................................... 50
7.2.6. DSD.HW ................................................................................................... 51
7.2.7. TILT.HW (K491 Only) ............................................................................... 51
7.3. SCALE (Loadcell options and calibration) ................................................................. 52
7.3.1. BUILD (Scale parameters) ........................................................................ 52
7.3.2. OPTION (Scale options) ........................................................................... 53
7.3.3. CAL (Scale calibration) ............................................................................. 54
7.3.4. QA (QA alarm) .......................................................................................... 54
7.4. FUNC (Special functions) ......................................................................................... 55
7.4.1. NUM (Number of special functions) .......................................................... 55
7.4.2. SFn: TYPE (Function Types) .................................................................... 55
7.4.3. SFn: KEY (Function Key / Remote Input ) ................................................. 56
7.4.4. SFn: PRINT (Printing Functions) .............................................................. 57
7.4.5. SFn: SINGLE (Single Serial Output Functions) ......................................... 58
7.4.6. SFn: BLANK (Blanking Functions) ............................................................ 58
7.4.7. SFn: COUNT, SFn: PIECE (Counting Functions) ................................... 59
7.4.8. SFn: UNITS (Unit Switching Functions) .................................................... 60
7.4.9. SFn: HOLD ............................................................................................... 60
7.4.10. SFn: PK.HOLD (Peak Hold)...................................................................... 61
7.4.11. SFn: PRD.SEL (Product Select) ............................................................... 61
7.4.12. SFn: THUMB (Thumbwheel Product Selection) ........................................ 61
7.4.13. SFn: REM.KEY (Remote Key Functions) .................................................. 62
7.4.14. SFn: REPORT (Report Printing Functions) ............................................... 62
7.4.15. SFn: HI.RES (High Resolution) ................................................................. 63
7.4.16. SFn: SC.EXIT (Scale Exit) ........................................................................ 63
7.4.17. SFn: SEMI.P.T (Semi-auto Preset Tare) ................................................... 63
7.4.18. SFn: A.TARE (Auto Tare) ......................................................................... 64
7.5. SER.NET (Network communications) ....................................................................... 65
7.6. SER.AUT (Automatic transmit) ................................................................................. 66
7.6.1. NUM (Number of Automatic Transmissions) ............................................. 66

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7.6.2. AUTO.n (Automatic Output Configuration) ................................................ 66
7.7. PRINT (Printouts) ..................................................................................................... 67
7.7.1. NUM (Number of printouts) ....................................................................... 67
7.7.2. HEADER (Print header) ............................................................................ 67
7.7.3. FOOTER (Print footer) .............................................................................. 67
7.7.4. PAGE (Print page options ......................................................................... 67
7.7.5. SPACE (Print blank space options) .......................................................... 68
7.7.6. PRINT.n … (Printout options) ................................................................... 68
7.8. SETP (Setpoints) ...................................................................................................... 69
7.8.1. NUM (Number of setpoints) ...................................................................... 69
7.8.2. SETP1 … SETP16 (Setpoint options) ....................................................... 69
7.9. ANL.OUT (Analogue Output) .................................................................................... 72
7.10. End (Save and exit) .................................................................................................. 72
8. CALIBRATION .................................................................................................................... 73
8.1. Performing a Digital Calibration with Test Weights ................................................... 73
8.1.1. ZERO (Zero Calibration Routine) .............................................................. 74
8.1.2. SPAN (Span Calibration Routine) ............................................................. 75
8.1.3. TILT (Tilt Calibration Routine K491 only) .................................................. 76
8.2. Performing a Calibration with Direct mV/V Entry ....................................................... 77
8.2.1. DIR.ZER (Direct Zero Calibration Entry) ................................................... 77
8.2.2. DIR.SPN (Direct Span Calibration Entry) .................................................. 77
8.3. Using Linearisation ................................................................................................... 78
8.3.1. ED.LIN (Edit Linearisation Points) ............................................................ 79
8.3.2. CLR.LIN (Clear Linearisation) ................................................................... 79
8.4. Calibration Errors ..................................................................................................... 80
8.5. Tilt Calibration Errors (K491 only) ............................................................................. 81
9. NETWORK COMMUNICATIONS ........................................................................................ 82
9.1. Introduction .............................................................................................................. 82
9.2. Network rinCMD ....................................................................................................... 82
9.2.1. Basic Message Format ............................................................................. 82
9.2.2. Termination .............................................................................................. 83
9.2.3. Error Handling .......................................................................................... 84
9.2.4. Ring Network Enhancement ..................................................................... 84
9.2.5. Calibrating an instrument over a network .................................................. 84
9.3. Network Protocol LUA BUFFER ............................................................................... 85
9.4. Network Protocol SIMPLE ........................................................................................ 85
9.5. Network Protocol BARCODE (K402 and K491 only) ................................................. 86
9.6. rinCMD Examples .................................................................................................... 87
10. AUTOMATIC WEIGHT OUTPUT ......................................................................................... 89
10.1. Overview .................................................................................................................. 89
10.2. Auto Weight Format String ....................................................................................... 89
11. PRINTING ........................................................................................................................... 91
11.1. Overview .................................................................................................................. 91
11.2. Print ID ..................................................................................................................... 91
11.3. Record printouts ....................................................................................................... 91
11.3.1. K401 ......................................................................................................... 91
11.3.2. K402 ......................................................................................................... 92
11.3.3. Custom Record Events (K401 and K402) ................................................. 92
11.4. Docket printouts ....................................................................................................... 92
11.4.1. K401 ......................................................................................................... 92
11.4.2. K402 ......................................................................................................... 93
11.4.3. Custom Docket Events (K401 and K402).................................................. 93
11.5. Report printouts ........................................................................................................ 94
11.6. Custom Printing ........................................................................................................ 94
11.6.1. Page Tokens ............................................................................................ 96
12. SPECIAL FUNCTIONS ....................................................................................................... 97
12.1. Introduction .............................................................................................................. 97
12.2. Key Functions ........................................................................................................... 97
12.2.1. NONE ....................................................................................................... 97
12.2.2. PRINT ...................................................................................................... 97

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12.2.3. SINGLE .................................................................................................... 98
12.2.4. TEST ........................................................................................................ 98
12.2.5. COUNT .................................................................................................... 99
12.2.6. PIECE .................................................................................................... 100
12.2.7. UNITS .................................................................................................... 101
12.2.8. HOLD ..................................................................................................... 103
12.2.9. PEAK HOLD ........................................................................................... 104
12.2.10. PRD.SEL ................................................................................................ 106
12.2.11. HI.RES ................................................................................................... 107
12.2.12. SC.EXIT ................................................................................................. 108
12.2.13. SEMI.P.T ................................................................................................ 108
12.2.14. A.TARE .................................................................................................. 108
13. SETPOINTS ...................................................................................................................... 109
13.1. Overview ................................................................................................................ 109
13.2. Outputs ................................................................................................................... 109
13.3. Common Settings ................................................................................................... 109
13.4. Weigh in (OVER) Setpoints and Weigh Out (UNDER) Setpoints ............................ 110
13.4.1. Additional Settings .................................................................................. 112
13.5. Status Based Setpoint Types ................................................................................. 112
13.6. Logic Setpoint Types .............................................................................................. 113
13.7. Scale Entry/Exit Setpoint Types.............................................................................. 116
14. ANALOGUE OUTPUT ....................................................................................................... 117
14.1. Overview ................................................................................................................ 117
14.2. Configuration of Hardware ...................................................................................... 117
14.2.1. Configuration .......................................................................................... 117
14.2.2. Calibration .............................................................................................. 117
14.2.3. Testing ................................................................................................... 117
14.3. Analogue Weight Transmission .............................................................................. 117
15. APPENDIX 1: DIMENSIONS ............................................................................................. 118
15.1. Legal Sealing Details .............................................................................................. 120
15.1.1. Trade Label ............................................................................................ 120
15.1.2. Lead Seals ............................................................................................. 121
15.1.3. Destructible Sticker Seals ....................................................................... 122
15.1.4. Electronic Seal........................................................................................ 122
16. APPENDIX 2: PRINT AND AUTOMATIC TRANSMISSION TOKENS .............................. 123
16.1. ASCII codes ........................................................................................................... 123
16.2. Use of Characters in the Extended ASCII table ...................................................... 123
16.3. Tokens ................................................................................................................... 124
16.3.1. Non-paged generic tokens ...................................................................... 124
16.3.2. Page tokens ........................................................................................... 124
16.3.3. Page 0 (BEH), 1 (BDH), 2 (BCH), 3 (BBH), 7 (B7H) tokens: Weight
Information ............................................................................................................. 125
16.3.4. Page 4 (BAH), 5 (B9H), 6 (B8H) tokens: Product Information: ................... 126
16.3.5. Page 8 (B6H) tokens: Miscellaneous weight data .................................... 126
16.3.6. Format tokens ........................................................................................ 127
17. APPENDIX 3: COMMUNICATIONS REGISTERS ............................................................. 128
18. APPENDIX 4: SETUP MENU QUICK REFERENCE ......................................................... 137
19. APPENDIX 5: ERROR MESSAGES ................................................................................. 140
19.1. Overview ................................................................................................................ 140
19.2. Weighing Errors ...................................................................................................... 140
19.3. Setup Errors ........................................................................................................... 140
19.4. Diagnostic Errors .................................................................................................... 141
20. APPENDIX 6: ETHERNET MODULE ................................................................................ 142
20.1. Overview ................................................................................................................ 142
20.2. Network Configuration ............................................................................................ 142
20.3. Viewing the Current Configuration .......................................................................... 142
20.4. Services ................................................................................................................. 142
20.4.1. TCP Sockets .......................................................................................... 142
20.4.2. Web Interface ......................................................................................... 142

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21. APPENDIX 7: M4501 DSD MODULE ................................................................................ 143
21.1. Overview ................................................................................................................ 143
21.2. Writing records ....................................................................................................... 143
21.3. Reading records ..................................................................................................... 143
22. GLOSSARY....................................................................................................................... 144
22.1. Glossary of Terms .................................................................................................. 144
22.2. List of Figures ......................................................................................................... 145
22.3. List of Tables .......................................................................................................... 145
23. INDEX................................................................................................................................ 146

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1. Introduction
1.1. Overview
This precision digital indicator uses the latest Sigma-Delta A/D technology to ensure
fast and accurate weight readings. The setup and calibration of the instrument are
digital, with a non-volatile security store for all setup parameters.
It may be operated from either a DC power source (12VDC to 24VDC) or AC power
(optional 110 – 240 VAC). There is a soft power on/off function that retains memory
of its state. Once an instrument is turned on it will automatically start up again if the
external power is interrupted.
Optical communications is fitted standard and allows for a temporary isolated
communications link to be established with a PC. Software upgrades, the use of
computerised setup and calibration can then be done using a PC. Refer to Optical
Communications page 15 for more information.
Figure 1: Weight Indicator
The instrument provides zero, tare and gross/net on the fixed function keys and
supports special functions (eg. peak-hold, counting, unit switching, etc.), via three
(3) user definable function keys and external inputs. Operator functions (clock,
view, report etc) and editing functions are provided on the alpha/numeric key pad. It
is equipped with an NVRAM store to ensure day-to-day operating settings (eg.
ZERO, TARE, CLOCK, etc.) are retained when power is removed.
The RS-232 communications port can be used for printer driving, connection to a
remote display or PC. The transmit only RS-485 communications port can be used
for remote displays. There is a built-in clock for date-stamping printed outputs.
The instrument can support different software applications depending on the
functionality required. This manual covers the K401, K402 and K491 software
variants, where the software provides differing functionality.
1.2. Document Conventions
The following document conventions (typographical) are used throughout this
Reference Manual.

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Bold Text Bold text denotes words and phrases to note.
<Key> <Key> denotes a Keypad key.
Note: In the Specifications section the < symbol means less than
and the > symbol means greater than.
^ This symbol denotes one space when describing serial output
formats.
 Items marked with  indicate that the setting is available only in Full
Setup and is trade critical. When trade critical settings are changed
the calibration counter is incremented.
Table 1: Document Conventions

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2. Specifications
Performance
Resolution Up to 100,000 divisions, minimum of 0.25V/division
Zero Cancellation
+/
-
2.0mV/V
Span Adjustment
0.1mV/V to 3.0mV/V
Stability/Drift Zero: < 0.15V/C (+ 10ppm of deadload max)
Span < 10 ppm/C, Linearity < 20ppm, Noise < 0.2Vp-p
Excitation 7.4 volts for up to 16 x 350 or 32 x 700 ohm load cells (4-wire or
6-wire plus shield)
Maximum total load cell resistance: 1,000 ohms
A/D Type
24bit Sigma Delta with
±
8,388,608 internal counts
Operating
Environment Temperature: –10 to +50C ambient
Humidity: <90% non-condensing
Storage: –20 to +50C ambient
IP55 when panel mounted
or with rear boot (otherwise IP40)
Case Materials
ABS, Silicon Rubber, Nylon, Acrylic (no halogen used)
Packing Weights
Basic
Indicator: 0.6
kg
Digital
Display LCD with 4 alpha-numeric displays and LED backlighting:
 Primary display: 6 x 28.4mm high digits with units and
annunciators
 2nd display: 9 x 17.6 mm digits with units
 3rd display: 8 x 6. 1mm digits

4
th
display: 4 x 7.
6
mm digits
Setup and
Calibration
Full digital with visual prompting in plain messages
Digital Filter
Sliding window average from 0.1 to
3
0
.0 seconds
Zero Range
Adjustable from
+/
-
2% to
+/
-
20% of full capacity
Power Input
Standard Power
Input
12 to 24VDC (15 VA max) - ON/OFF key with memory feature
Variants AC
M4101
Input: 110/240VAC 50/60Hz
Output:
12VDC
15VA
Features
Optical Data
Communications
Magnetically coupled optical communications support. Optional
conversion cable connects directly to a standard USB or RS-232
port
.
Correction
10
point linearity correction
Serial Outputs RS-232 serial port for remote display, network or printer supports.
RS-485 transmit only for remote display
Transmission rate:
1200,
2400, 4800
,
9600
,
19200
or 57600
baud
3 assignable
f
unction
k
ey
s
Printing, unit switching, counting, manual hold, peak hold and
totalising
Battery Backed
Cloc
k Calendar
Battery life 10 years minimum
Approvals FCC, CE, C-tick
Check trade approvals
Table 2: Instrument specifications

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3. Installation
3.1. Introduction
The following steps are required to set up the indicator.
 Inspect indicator to ensure good condition.
 Use connection diagrams to wire up load cell, power and auxiliary cables as
required.
 Insert any accessory modules that are being used.
 Use the drill hole template provided for hole locations.
 Connect Power to indicator and press <POWER> key to turn the instrument On.
 Refer to the Setup Menus section on page 42 for information on configuring the
instrument.
 To turn instrument OFF press and hold <POWER> key for three seconds (until
display blanks).
3.2. General Warnings
 Indicator not to be subject to shock, excessive vibration or extremes of temperature
(before or after installation).
 Inputs are protected against electrical interference, but excessive levels of electro-
magnetic radiation and RFI may affect the accuracy and stability.
 The instrument should be installed away from any sources of excessive electrical
noise.
 The load cell cable is particularly sensitive to electrical noise and should be located
well away from any power or switching circuits.
 For full EMC or for RFI immunity, termination of cable shields and correct earthing
of the instrument is essential.
3.3. Electrical Safety
 For your protection all mains electrical hardware must be rated for environmental
conditions of use.
 Pluggable equipment must be installed near an easily accessible power socket
outlet.
 To avoid the possibility of electric shock or damage to the instrument, always switch
off or isolate the instrument from the power supply before maintenance is carried
out.
3.4. Cleaning
 To maintain the instrument, never use harsh abrasive cleaners or solvents. Wipe
the instrument with a soft cloth slightly dampened with warm soapy water.
3.5. Panel Mount Template
The panel mount template is supplied with the instrument. It shows the location of
the rectangular cut-out and the four mounting screws.
3.6. Cable Connections
All cable connections are made to the rear of the instrument using pluggable screw
terminals. It is not necessary to tin the ends of the wires with solder or to add crimp
ferrules to the wires, however, these techniques are compatible with the terminals.

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Figure 2: Cable Connections
3.7. DC Power (DC PWR + , DC PWR –)
The DC supply need not be regulated, provided that it is isolated and free of
excessive electrical noise and sudden transients. The instrument can be operated
from a high quality plug-pack as long as there is sufficient capacity to drive both it
and the load cells.
3.8. Load Cell Connection
3.8.1. Load Cell Signals and Scale Build
Very low output scale bases may be used but may induce some instability in the
weight readings when used with higher resolutions. Generally speaking, the higher
the output, or the lower the number of divisions, the greater the display stability and
accuracy.
The instrument can display the milliVolt-per-Volt reading which can be used to
check scale base signal output levels. For more information, refer to LC.HW MVV
Display page 47.
The instrument may be connected for either 4-wire or 6–wire operation. Use 4-wire
when external SENSE connections are not available.
3.8.2. 4-Wire Connection
The minimum connectivity requirements are the connection of four wires (i.e.
±Excitation and ±Signal). Internally the instrument has a precision analog switch
that can be used to connect the Sense+ and Sense– lines directly to the
Excitation+ and Excitation– lines.
Any addition to the load cell manufacturer's cable length using 4-wire connection is
only recommended for short cable runs. Where long additions to cable lengths are
needed, a 6-wire extension is required.
The BUILD:CABLE option must be set to 4-WIRE to allow for 4-wire connection.

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Figure 3: 4-Wire Connections
3.8.3. 6-Wire Connection
The excitation and signal lines are connected the same as for a 4-wire installation.
The extra two wires (Sense + and –) should be connected to the Excitation + and –
lines as close as possible to the load cell itself. Typically these connections are
made in a load cell termination box. If the sense lines are not connected in 6 wire
mode then E2000 will be shown.
The BUILD:CABLE option must be set to 6-WIRE to allow for true 6-wire connection.
Figure 4: Loadcell Connections
3.9. Auxiliary Connections
This section provides diagrams to illustrate the communication connections.

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3.9.1. RS-232 Serial
 Direct Personal Computer Link (RX, TX, GND)
Figure 5: RS-232 - Instrument to PC using COM Port (DB9)
 Printer Connections (TX, DTR and GND)
Figure 6: RS-232 – Instrument to Printer (DB25)
 Remote Display (TXD, GND)
Refer to documentation supplied with the Remote Display for connection
details. Connect RX on the Remote Display with TX on the instrument and
connect the RS232 GND signals together.
 Ring Networks: Multiple Instruments to PC (RXD, TXD, GND)
Instruments with software revision V2.31+ can be configured in a Ring Network
via a M42xx module (software revision 1.01+). This feature is not available on
the inbuilt serial port. This also requires an enhancement in the PC software.
The Short Ring Network layout (Figure 7) can be used in situations up to a total
cable run length of about 150 m (500 ft) at 9600 baud in a clean EMC
environment. If there are communications errors, or for longer cable runs, lower
the baud rate to 4800 or 2400, and/or use the Long Ring Network in Figure 8,
which uses a separate return path from the ‘Last Instrument’ to the PC.
For DB25 connections at the PC connector, refer to Figure 6.

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When operating in a Ring Network, the Instruments must have:
 same serial port options, i.e., baud, parity, data bits, stop bits;
 unique addresses.
Figure 7: RS-232 Short Cable Runs (Ring Network using COM Port)

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Figure 8: RS-232 Long Cable Runs (Ring Network using COM Port)
3.9.2. RS-485 Serial
 Remote Display (TA, TB)
RS485 is recommended for communicating over distances longer than a few
metres. Connect TA to RA and TB to RB on the remote display.
 Multi-drop Networks: Multiple Instruments to PC (TA, TB, RA, RB)
Using a RS485 module it is possible to implement a multi-drop network.. This
feature is not available on the inbuilt serial port.

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 Ring Networks: Multiple Instruments to PC (TA, TB, RA, RB)
Instruments with software revision V2.31+ can be configured in a Ring Network
via a M42xx module (software revision 1.01+). This feature is not available on
the inbuilt serial port. This also requires an enhancement in the PC software.
When operating in a Network, the Instruments must have:
 same serial port options, i.e., baud, parity, data bits, stop bits;
 unique addresses.
3.10. Optical Communications
A temporary infrared communications link can be established between the
instrument and a PC using an optional cable. This connection can be used to
transfer setup and calibration information from a PC or to download software
upgrades.
The PC end of the cable is a standard USB or female DB9 RS232 connector. The
instrument end of the cable attaches to the left side of the instrument display.
WARNING
The optical coupling head contains a strong magnet and should not be placed
near any magnetic storage media (eg. credit cards, floppy disks etc.)

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Page 16 004R-600-230
Figure 9: Optical Communications attachment
3.11. Connecting Shields
To obtain full EMC or for RFI immunity, cable shields MUST be connected and
the earth lug on the rear of the instrument must be grounded.
Figure 10 illustrates an example of possible connections. Also shown are the
connecting cables restrained using cable ties fastened by screws into the rear of the
unit.

Reference Manual Rev 2.30
004R-600-230 Page 17
Figure 10: Cable Shield Connection
3.11.1. Cable Shield Connection and Earthing
 Care should be taken when connecting shields to maximise EMC or RFI immunity
and minimise earth loops and cross-talk (interference) between instruments.
 For full EMC or for RFI immunity, termination of the cable shields to the connectors
is very important. The earth lug of the instrument must be separately connected to
ground potential via a reliable link.
 The AC power module directly connects the earth lug to the Earth Pin on the power
supply. In installations where earth is available on the power cable, instrument
earthing can be done with this connection.
 The instrument should only be connected to earth via a single reliable link to avoid
earth loops.
 Where each instrument is separately earthed, interconnecting cable shields should
be connected at one end only. This also applies to communications cable shields in
Ring Networks, refer to Short Ring Network and Long Ring Network connections
under Section 3.9.1 on page 12.
 Caution: Some load cells connect the cable shield directly to the load cell (and
therefore the scale base). Connection of the load cell cable shield in this situation
may be site specific.
3.12. Regulatory Sealing Requirements
To comply with regulatory sealing requirements for each instrument, (i.e. to ensure
instruments are not accidentally or deliberately tampered with), it is important that
proper sealing procedures be adhered to. Refer to Legal Sealing page 120 for more
information.

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3.13. Accessory Module connection
Up to 4 accessory modules can be plugged into the rear of the instrument. There
are many types of modules which can be used. These modules provide additional
features such as:
 power supply options, e.g. mains power or batteries
 communications ports, e.g. Ethernet or RS485 networking
 analogue outputs, e.g. 4-20mA or 0-10V
 digital inputs and digital outputs, e.g. external buttons or setpoint outputs
 Alibi memory, e.g. DSD functionality.
Caution: Instrument must be switched off before connecting or disconnecting
accessory modules.
Each module will come with a manual which explains the features, installation and
use of the module.
After connection, the module needs to be configured using the instrument setup
menus. All hardware test functions and hardware options (such as serial baud rates
or digital input debouncing) are in the H.WARE (hardware) menu described in
section 0 page 47. Module resources (such as digital inputs or serial ports) are
assigned in specific function menus. For example, the output used by a particular
setpoint is set in the setpoint menu.
The details of the accessories can be viewed using the Acc key (long press of the 0
key), refer to 5.2.15 (Acc – 0 key) page 38.
Note: Power supply options can only be connected in the left position. Other
modules can be connected in any position.