Rice Lake BCD Manual

76127
BCD
Interface for the 520 Indicator
Installation and Configuration
Manual

Contents
About This Manual ................................................................................................................................... 1
1.0 Introduction.................................................................................................................................. 1
2.0 Installation ................................................................................................................................... 2
2.1 BCD Option Card Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2 Dip Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 Data Information .......................................................................................................................... 6
3.1 Operation of Remote Switch Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Floating Decimal Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Polarity Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.0 Parts List .................................................................................................................................... 12
BCD Option Limited Warranty ................................................................................................................ 13
©2008 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
January 2008
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com or obtained
by calling 715-234-9171 and asking for the training department.

2BCD Interface Installation and Configuration Manual

Introduction 1
About This Manual
This manual is intended for use by service technicians
responsible for installing the BCD option in 920i®
digital weight indicators.
This manual applies to indicators using Version 1.04
of the 920i software.
Some procedures described in this manual
require work inside the indicator enclosure.
These procedures are to be performed by
qualified service personnel only.
1.0 Introduction
The BCD interface is used with 520 digital weight indicators to send weight and status information to remote
displays, printers and other peripheral devices. The data is updated after each display update and continuously
available for use.
The BCD interface option is CMOS, NMOS, and TTL compatible. BCD outputs are capable of sourcing/sinking
20mA.
The BCD option comes with a BCD interface option card and ribbon cable. An external port provides for
connection of a DB-37 interface cable (which exits the back of the 520) for communication to a peripheral
device. See the 520 Installation Manual (PN 68973) for proper connections on the 520 CPU board.
The BCD (binary-coded decimal) option uses a straight assignment of the binary equivalent. The weights of the
BCD code are 8, 4, 2, and 1. See Table 1-1 for decimal to binary conversion.
7ARNING
Decimal Digit
BCD
8421
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001
Table 1-1. Decimal to Binary Conversion

2BCD Interface Installation and Configuration Manual
2.0 Installation
Figure 2-1 shows the BCD option card as installed in the 520 indicator. The indicator enclosure must be open to
install the BCD card.
The 520 has no on/off switch. Before opening the unit, ensure the power cord is disconnected from the
power outlet.
Use a wrist strap to ground yourself and protect components from electrostatic discharge (ESD) when
working inside the indicator enclosure.
These units use double pole/neutral fusing which could create an electric shock hazard. Procedures
requiring work inside the indicators must be performed by qualified service personnel only.
2.1 BCD Option Card Installation
1. Disconnect the 520 indicator from power source.
2. Place the indicator on an antistatic work mat. Remove screws that hold the backplate or cover to the
enclosure body, then lift the backplate or cover away from the enclosure and set it aside.
3. Use the 8-32 nuts in hardware kit to secure DB-37 connector plate to backplate of indicator.
Figure 2-1. 520 Indicator with BCD Option Installed
4. Carefully align the large option card connector (J1) with connector J2 on the 520 CPU board. Press down
to seat the option card in the CPU board connector.
5. Use the 4-40 screws provided in the option kit to secure the other end of the option card to the threaded
standoffs on the 520 CPU board.
6. Plug 40-pin ribbon cable to J4 on BCD card.
Do not connect communications to J3 if switch SW1-4 is in Units mode.
7ARNING
#AUTION
BCD Option
Board
Configuration
Dip Switch
7ARNING

Installation 3
7. Plug serial cable to J3 on BCD card. Plug other end of serial cable to J8 on 520 CPU board. Use the
nylon tie in the parts kit to secure the serial cable to the mounting pem (see Figure 2-2 below).
NOTE: When connecting serial cable to J8 of 520 CPU board, be sure that red wire goes to TX (transmit), black wire to
GND (ground), and green wire to RX (receive).
Figure 2-2. Serial Cable Tie
Figure 2-3. BCD Option Card
Plug in ribbon
connector to the
back of the 520
indicator.
Snaps onto the
520 CPU board.
(J2)
C24
C2
5V
R18
R7
C10
C8
C9
C23
C5
R17
R19
R10
R9
R1
R3
R13
R12 R15
R14
C4 GND
GD1
C12
C20
C21
C14
C7
C6
R
4
R
5
3.3V
C16
C17
R8
U1
C1
C19
U3
U8
C15
C11
U5
R6
C25
R2
VR2
R11
C3
1
J3
U4
U7
C13
C18
R16
U2
C22
VR1
J2
U6
C26
J4
SW1
1
J1
L
D
1
Rx
Tx
40
39 1
34
33
D
1
0
32
1
658
2
2003
ISP
Revision
2
147
P/N
Gnd
RICELAKE WEIGHING SYSTEMS
SW1
Configuration Dip Switch
784512 63
OPEN
784512 63
OPEN

4BCD Interface Installation and Configuration Manual
2.2 Dip Switch Configuration
The BCD option card contains dip switches (see Figure 2-3 on page 3). Move the switches to configure BCD
interface parameters (see Table 2-1).
Unit Status Bit/Communications Output Selection
See Table 2-2 for unit status bit/communications output select configuration.
By connecting J3 on the BCD board to J8 on the 520 board, communications mode allows the throughput of
connector J3 to be used as a wiring path for communications from the 520 indicator to an external device through
the DB-37 connector. It is not a communications port, rather an alternative route for wiring a 520 communication
port to an external device.
Do not connect communications to J3 if switch SW1-4 is in Units mode.
Units/Tri-State Input
See Table 2-4 below, for information on configuring units or tri-state input modes.
SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8
DEC_1 DEC_2 POL_SEL Units/Com Select Units Input Select Tri-State Select Reserved Reserved
Table 2-1. Dip Switch Configuration Modes
SW1-4 Mode
0Unit Status Bit mode – Indicates primary or secondary
1Communications Select mode – RS-232
Table 2-2. Units Status Bit/Communications Select Mode Configuration
BCD Option Card 520 Indicator
J3-1 TX J8-1 TX
J3-2 Gnd J8-2 Gnd
J3-3 RX J8-3 RX
Table 2-3. J3/J8 Connections
SW1-5 SW1-6 Mode
0 0 Not valid
0 1 Units enable
1 0 Tri-State enable
1 1 Off
Table 2-4. Units/Tri-State Input Configuration
7ARNING

Installation 5
Decimal Rotation Configuration
See Table 2-5 below for information on configuring dip switch for decimal rotation. See Section 3.2 on page 11
for more information on decimal rotation.
Polarity Bit Select
See Table 2-6 below, for information on configuring polarity bit select mode. See Section 3.3 on page 11 for
more information on polarity switch.
SW1-1 SW1-2 Parallel Output Format
0 0 No rotation
0 1 Rotate left enable
1 0 Rotate right enable (primary only)
1 1 Reserved
Table 2-5. Decimal Rotation Configuration
SW1-3 State
1+ Polarity (logic 1 = +5V) ; – Polarity (logic 0 = common)
0+ Polarity (logic 0 = common); – Polarity (logic 1 = +5V)
Table 2-6. Polarity Bit Select Configuration

6BCD Interface Installation and Configuration Manual
3.0 Data Information
The following sections provide information on BCD pin-outs, data information, and remote switches.
Figure 3-1. BCD External Connection
NOTE: The 520 parallel BCD option does not have a floating ground. For proper operation, it is necessary to connect Logic
Common of the BCD peripheral device to Logic Common pins 1 and 2 of the BCD option.
10
12
14
16
18
8
7
6
20
24
23
22
21
32
27
26
25
31
30
29
28
9
11
13
15
17
19
5
35
34
37
4
33
3
36
1
2
DB-37
Logic 0 = See Section 3.3 on page 10
Logic 1 = Center of Zero
Logic 1 = Valid Print
Logic 0 = Data Registers Changing
Logic 0 = Overload/Underload
Logic 0 = Scale in Motion
Logic 1 = Secondary or TX Serial Output: if dip switch configuration
Logic 1 = Net Mode is properly selected
See Figure 3-2
RX Serial Input: if dip switch configuration is properly selected.
No connect otherwise
Leading “1”
“1”
“2”
“4”
“8”
“1”
“2”
“4”
“8”
“1”
“2”
“4”
“8”
“1”
“2”
“4”
“8”
“1”
“2”
“4”
“8”
Polarity Bit
Zero Bit
Print Enable Bit
DataValid Bit
Overload Bit
Motion Bit
Units Bit/TX Serial Output
Gross/Net Bit
Gross/Net Switch Input
Zero Switch Switch Input
Hold Switch Switch Input
AutoTare Switch Input
UnitSelect (or Tri-State Enable)
Switch Input
Serial Input
Logic Common
Logic Common
Digital Common
(Not Chassis or Earth Ground)
See note below
MSD
(Most Significant Digit)
4th SD
3rd SD
2nd SD
LSD
(Least Significant Digit)

Data Information 7
Pin Description
1Logic Common
2Logic Common
3Units (primary/secondary) Switch or Tri-State Enable Input. Serves as remote input switch for the Units or Tri-State
function. Change of state toggles units between primary or secondary; or Logic 1 places output in Tri-State mode.
See Section 2.2 on page 4 for dip switch configuration
4Hold Switch. Input freezes the BCD registers
5Units Bit. Specifies the status of the units; Logic 1 = secondary units, or if enabled by dip switch configuration,
accesses TX serial output
64th SD -4
74th SD -2
84th SD -1
9Polarity Bit. Specifies the status of the polarity. See Section 3.3 on page 11
10 Leading One. Logic 1 if the sixth significant digit is odd; Logic 0 if it is even. See Figure 3-1 on page 6
11 Zero Bit. Specifies the status of zero. Logic 1 = center of zero
12 MSD 1
13 Print Enable Bit. Specifies data valid, no motion, no overload/underload and positive gross weight. Hold switch
must be at logic 1 (OFF). Logic 1 = print enabled
14 MSD 2
15 Data Valid Bit. Informs the external device that the BCD output registers have been updated and the data is “true.”
Data is not valid if the display shows other than numeric data, if the display is held (in regulatory modes), or if data
integrity has been lost. This bit will toggle momentarily to Logic 0 each time the registers are updated. Logic 0 =
data not valid
16 MSD 4
17 Overload Bit. Specifies the status of positive or negative scale overload. Logic 0 = overload/underload
18 MSD 8
19 Motion Bit. Specifies the status of motion on the scale. Logic 0 = scale in motion
20 4th SD 8
21 3rd SD 8
22 3rd SD 4
23 3rd SD 2
24 3rd SD 1
25 2nd SD 8
26 2nd SD 4
27 2nd SD 2
28 LSD 8
29 LSD 4
30 LSD 2