Parker 6513 User manual

6513
RS485/RS232 Communications Interface
HA466357U001 Issue 7
Technical Manual
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Cont.1
RS485/RS232
Communications
Interface
Technical Manual
HA466357U001 Issue 7
Compatible with Version 5.x Software
2011 Parker SSD Drives, a division of Parker Hannifin Ltd.
All rights strictly reserved. No part of this document may be stored in a retrieval system, or transmitted in any
form or by any means to persons not employed by a Parker SSD Drives company without written permission
from Parker SSD Drives, a division of Parker Hannifin Ltd . Although every effort has been taken to ensure the
accuracy of this document it may be necessary, without notice, to make amendments or correct omissions.
Parker SSD Drives cannot accept responsibility for damage, injury, or expenses resulting therefrom.
WARRANTY
Parker SSD Drives warrants the goods against defects in design, materials and workmanship for the period of
24 months from the date of manufacture, or 12 months from the date of delivery (whichever is the longer
period), on the terms detailed in Parker SSD Drives Standard Conditions of Sale IA500504.
Parker SSD Drives reserves the right to change the content and product specification without notice.

Cont.2
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS
DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL
INJURY AND PROPERTY DAMAGE.
This document and other information from Parker-Hannifin
Corporation, its subsidiaries and authorized distributors
provide product or system options for further investigation by
users having technical expertise.
The user, through its own analysis and testing, is solely
responsible for making the final selection of the system and
components and assuring that all performance, endurance,
maintenance, safety and warning requirements of the
application are met. The user must analyze all aspects of the
application, follow applicable industry standards, and follow
the information concerning the product in the current product
catalog and in any other materials provided from Parker or its
subsidiaries or authorized distributors.
To the extent that Parker or its subsidiaries or authorized
distributors provide component or system options based upon
data or specifications provided by the user, the user is
responsible for determining that such data and specifications
are suitable and sufficient for all applications and reasonably
foreseeable uses of the components or systems.

Cont.3
Requirements
IMPORTANT: Please read this information BEFORE installing the equipment.
Intended Users
This manual is to be made available to all persons who are required to install, configure or
service equipment described herein, or any other associated operation.
The information given is intended to highlight safety issues, EMC considerations, and to enable
the user to obtain maximum benefit from the equipment.
Complete the following table for future reference detailing how the unit is to be installed and
used.
INSTALLATION DETAILS
Model Number
(see product label)
Where installed
(for your own
information)
Unit used as a:
(refer to Certification
for the Inverter)
Component Relevant Apparatus
Unit fitted: Wall-mounted Enclosure
Application Area
The equipment described is intended for industrial motor speed control utilising DC motors, AC
induction or AC synchronous machines
Personnel
Installation, operation and maintenance of the equipment should be carried out by qualified
personnel. A qualified person is someone who is technically competent and familiar with all
safety information and established safety practices; with the installation process, operation and
maintenance of this equipment; and with all the hazards involved.
Product Warnings
Caution
Risk of electric
shock
Caution
Refer to
documentation
Earth/Ground
Protective
Conductor
Terminal
Safety Information
!

Cont.4
Hazards
DANGER! - Ignoring the following may result in injury
1. This equipment can endanger life by exposure to
rotating machinery and high voltages.
2. The equipment must be permanently earthed due to the
high earth leakage current, and the drive motor must be
connected to an appropriate safety earth.
3. Ensure all incoming supplies are isolated before
working on the equipment. Be aware that there may be
more than one supply connection to the drive.
4. There may still be dangerous voltages present at power
terminals (motor output, supply input phases, DC bus
and the brake, where fitted) when the motor is at
standstill or is stopped.
5. For measurements use only a meter to IEC 61010
(CAT III or higher). Always begin using the highest
range.
CAT I and CAT II meters must not be used on this
product.
6. Allow at least 5 minutes for the drive's capacitors to
discharge to safe voltage levels (<50V). Use the
specified meter capable of measuring up to 1000V
dc & ac rms to confirm that less than 50V is present
between all power terminals and earth.
7. Unless otherwise stated, this product must NOT be
dismantled. In the event of a fault the drive must be
returned. Refer to "Routine Maintenance and
Repair".
WARNING! - Ignoring the following may result in injury or damage to equipment
SAFETY
Where there is conflict between EMC and Safety requirements, personnel safety shall always take precedence.
•Never perform high voltage resistance checks on the
wiring without first disconnecting the drive from the
circuit being tested.
•Whilst ensuring ventilation is sufficient, provide
guarding and /or additional safety systems to prevent
injury or damage to equipment.
•When replacing a drive in an application and before
returning to use, it is essential that all user defined
parameters for the product’s operation are correctly
installed.
•All control and signal terminals are SELV, i.e.
protected by double insulation. Ensure all external
wiring is rated for the highest system voltage.
•Thermal sensors contained within the motor must
have at least basic insulation.
•All exposed metalwork in the Inverter is protected
by basic insulation and bonded to a safety earth.
•RCDs are not recommended for use with this
product but, where their use is mandatory, only Type
B RCDs should be used.
EMC
•In a domestic environment this product may cause radio
interference in which case supplementary mitigation
measures may be required.
•This equipment contains electrostatic discharge (ESD)
sensitive parts. Observe static control precautions
when handling, installing and servicing this product.
•This is a product of the restricted sales distribution
class according to IEC 61800-3. It is designated as
“professional equipment” as defined in
EN61000-3-2. Permission of the supply authority
shall be obtained before connection to the low
voltage supply.
CAUTION!
APPLICATION RISK
•The specifications, processes and circuitry described herein are for guidance only and may need to be adapted to the
user’s specific application. We can not guarantee the suitability of the equipment described in this Manual for
individual applications.
RISK ASSESSMENT
Under fault conditions, power loss or unintended operating conditions, the drive may not operate as intended.
In particular:
•Stored energy might not discharge to safe levels as
quickly as suggested, and can still be present even
though the drive appears to be switched off
•The motor's direction of rotation might not be controlled
•The motor speed might not be controlled
•The motor might be energised
A drive is a component within a drive system that may influence its operation or effects under a fault condition.
Consideration must be given to:
•Stored energy •Supply disconnects •Sequencing logic •Unintended operation
Safety Information
!

Contents
Contents Page
Cont.5
RS485/RS232 COMMUNICATIONS INTERFACE 1
A System Overview .......................................................................................... 1
Protocols.................................................................................................................... 1
•EI Bisynch ASCII/Binary ............................................................................ 1
•MODBUS RTU ......................................................................................... 2
Product Features ........................................................................................................ 2
Product Code............................................................................................................. 2
Installation....................................................................................................... 3
RS485/RS232 Communication Module (650V Frames 1, 2 & 3) ................................... 3
•LED Indications........................................................................................ 4
RS485 Communications Option (650V Frames C, D, E & F) ......................................... 5
Terminators ............................................................................................................... 5
System Recommendations .......................................................................................... 6
•PLC/SCADA Supervisor ............................................................................ 6
Initial Set-up for EI Bisynch ASCII.................................................................... 7
Configuring the Drive................................................................................................. 7
Configuring the PLC/SCADA Supervisor .................................................................... 10
ASCII Communications............................................................................................. 11
•What Information Can I Transfer? .......................................................... 11
•How is the Information Transferred? ....................................................... 11
•Programmer’s Information ..................................................................... 13
•EI Bisynch ASCII Message Protocol.......................................................... 14
•EI Bisynch ASCII Parameter Mapping ...................................................... 15
•EI Bisynch ASCII Sequence Diagrams ...................................................... 18
•Transferring Data - ASCII Example Messages .......................................... 19
Character Definitions ............................................................................................... 24
Control Character Definitions ................................................................................... 24
Last Error Code (EE) ................................................................................................. 25
Initial Set-up for MODBUS RTU ..................................................................... 26
Configuring the Drive............................................................................................... 26
Configuring the PLC/SCADA Supervisor .................................................................... 29
MODBUS RTU Communications ............................................................................... 29
•How is the Information Transferred? ....................................................... 29
•RTU Mode of Transmission..................................................................... 30
•Cyclic Redundancy Check ...................................................................... 30
•Function Codes ..................................................................................... 34
•Typical Transmission Line Activity............................................................ 42
•MODBUS RTU Parameter Mapping ........................................................ 43
ASCII Table.............................................................................................................. 46

ASCII 1
RS485/RS232 Communications Interface
RS485/RS232 COMMUNICATIONS INTERFACE
A System Overview
The RS485/RS232 Communications Interface provides a serial data port, allowing VSDs
(variable speed drives) to be linked to form a network. Using a PLC/SCADA or other intelligent
device, this network can be continuously controlled to provide supervision and monitoring for
each VSD in the
system.
With each unit under
local control, the
central supervisor
performs only periodic
setpoint updating,
control sequencing and
data collection.
In the system, the
PLC/SCADA
supervisor acts as the
Master, and the VSD as
the Slave.
The network of VSDs
can be set-up using just
one unit’s
MMI/Keypad, or
connection to ConfigEd
Lite (or other suitable
PC programming tool).
Protocols
EI Bisynch ASCII/Binary
Note:
The RS485/RS232 Communications Interface supports EI Bisynch ASCII only, not Binary.
These communications protocols come under the heading of Binary Synchronous
Communications Data Link Control (BSCDLC).
This is all part of an internationally recognised ANSI standard protocol called BISYNCH
(Binary Synchronous) and is known by the abbreviation x3.28.
They are widely used by manufacturers of computers, computer peripherals, and
communications equipment.
EI BISYNCH, the specific form of communication used, corresponds with the following full
American National Standard definition:
•ANSI Standard: x3.28, Revision: 1976
•Establishment and Termination Control Procedures Sub-category 2.5:
Two-way Alternate, Non-switched Multi-point with Centralised Operation & Fast
Select
•Message Transfer Control Procedure Sub-category B1:
Message Associated Blocking with Longitudinal Checking & Single Acknowledgement
This is known by the abbreviation ANSI - x3.28 - 2.5 - B1.
Advantages with this type of control system
1. Multi-wire analog transmission from a central programmable
controller is replaced by a bussed digital system using serial data
transmission over 3 wires (RS232) or differential twisted-pair
wires (RS485).
2. Digital transmission is fundamentally less noise-prone than
analog methods, and the accuracy of the transmitted data is
unaffected by the transmission medium. The use of intelligent
devices at either end of the data link allows error checking to be
used. This virtually eliminates the effects of electrical noise on
data integrity. It is therefore possible to issue setpoints to drives
with much higher accuracy using this method.
3. The RS485 communication standard allows multiple drives to be
connected to a single link which can be driven from a computer
serial port. Additional drives can be readily accommodated
through additional ports. The RS232 communication standard
allows for a single drive to be connected to the master. Most
computers are equipped with RS232 serial ports which can be
easily converted to accommodate the RS485 standard. Modules
are available from Parker SSD Drives to make this conversion.
4. The chosen standard and protocol are compatible with other
Eurotherm Group products. Temperature controls, process
controls, data loggers and drives can communicate easily with a
common supervisory system.

2 ASCII
RS485/RS232 Communications Interface
MODBUS RTU
The MODBUS RTU (Remote Terminal Unit) protocol is an efficient binary protocol. Each
message must be transmitted in a continuous stream.
Product Features
•Suitable for use with:
650/650V software version 4.x onwards
•Connection using 2-wire shielded twisted pair (RS485)
•Connection using 3-wire un-shielded cable (RS232)
•Configured using Function Block inputs
•Software-selectable Baud Rate
•Software-selectable Slave Address
•Direct tag access for all parameters
Product Code
The Parker SSD Drives’ product is fully identified using an alphanumeric code which records
how the product was assembled, and its various settings when despatched from the factory.
Product Product Code when
supplied with the Drive
Product Code when
supplied separately
650
Frames 1, 2 & 3
Supplied separately 6513-**** plug-in Communications
Module
650V
Frames 1, 2 & 3
Supplied separately 6513-**** plug-in Communications
Module
650V
Frames C, D, E & F
Legacy code (where X is the Frame size letter)
650VX/xxxx/xxx/xxxx/xx/x/RS485/x/x/x
New product code
650V-xxxxxxxx-xx2xxx-xx
Factory-fitted Communications Option -
not supplied separately

ASCII 3
RS485/RS232 Communications Interface
Installation
WARNING!
Before installing, ensure that the drive and all wiring is electrically isolated and
cannot be made “live” unintentionally by other personnel.
Wait 5 minutes after disconnecting power before working on any part of the
system or removing the covers from the Drive.
RS485/RS232 Communication Module (650V Frames 1, 2 & 3)
You can create a network of drives by linking a Master (PC/PLC) to one or more 650V drives
fitted with this module.
Plug this Communication Module on to the front of the 650V drive, replacing the keypad.
It converts signals from the host 650V drive into RS485 or RS232, and vice versa, so that
information can be shared between the Master and 650V drive(s).
Wiring is very simple - all connections are SELV (Safe Extra Low Voltage). Select to use
RS485 or RS232 by wiring to the appropriate terminal on the module.
Note: RS485 and RS232 terminals cannot be used simultaneously.
We recommend you ground the module to the system earth using the Functional Earth terminal.
RS485 Connections RS232 Connections
master to single/multiple slave master to single slave only
Tx
Rx
0V
9-Way or 25-Way
D-Type Connector
PC/PLC
9-Way / 25-Way
D-Type
PC/PLC
A
B
Scn
A
B
To PC/PLC
Chassis
650 Drive
with
Module
Connector
Functional
Earth
Drive Master
PC/PLC
Drive Drive Drive Master
PC/PLC

4 ASCII
RS485/RS232 Communications Interface
3Wiring Specifications
RS485 Connections RS232 Connections
Network Type 2-Wire Shielded Twisted-Pair 3-Wire Un-Shielded Cable
Connections A=RxA/TxA, B=RxB/TxB, Shield Rx, Tx, Ground (0V)
Signal Levels To RS485 Standard To RS232 Standard
Receiver Input
Impedance
¼ Unit Load 3 kΩminimum
7kΩmaximum
Maximum Cable Length 1200m (4000ft) 3 metres
Maximum Baud Rate 57.6kbaud 57.6kbaud
Maximum Number of
Units
32 including slaves and masters 2: 1 master and 1 slave
only
LED Indications
The module has three LEDs providing diagnostic
information about the 650V host drive's ‘Health’,
‘Receive’ and ‘Transmit’ activity.
HEALTH = Green, Rx = Red, Tx =Red
LED Name LED Duty Drive State
HEALTH SHORT FLASH Re-configuration, or corrupted non-volatile
memory at power-up
EQUAL FLASH Tripped
ON Healthy
LONG FLASH Braking
OFF No drive power, or serious hardware fault
Rx INTERMITTENT Indicates activity on the ‘receive’ line
carrying data from the Master
Tx INTERMITTENT Indicates activity on the ‘transmit’ line
carrying data to the Master

ASCII 5
RS485/RS232 Communications Interface
A/18
B/17
120 Ω
RS485
ON OFF
SW1
Frames 1-3 Frames C-F
RS485 Communications Option (650V Frames C, D, E & F)
You can create a network of drives by linking a Master (PC/PLC) to one or more 650V drives
fitted with this additional 3-way terminal. It is factory-fitted to the right hand side of the control
board.
Signals from the host 650V drive are converted into RS485, and vice versa, so that information
can be shared between the Master and 650V drive(s).
Wiring is very simple - all connections are SELV (Safe Extra Low Voltage).
RS485 Connections
master to single/multiple slave
9-Way / 25-Way
D-Type
PC/PLC
A
B
To PC/PLC
Chassis
A
B
Scn
650V Drive
with
RS485 option
Connector
A
B
Scn
650V Drive
with
RS485 option
Master
PC/PLC
Drive
DriveDrive
Wiring Specifications
RS485 Connections
Network Type 2-Wire Shielded Twisted-Pair
Connections A=RxA/TxA, B=RxB/TxB, Scn = Screen (shield)
Signal Levels To RS485 Standard
Receiver Input Impedance ¼ Unit Load
Maximum Cable Length 1200m (4000ft)
Maximum Baud Rate 57.6kbaud
Maximum Number of Units 32 including slaves and masters
Terminators
The last drive in a system must have a terminating resistance. All other drives in the system
should not have a terminator.
Frames 1-3 drives require a 120Ωterminating resistor
fitting to terminals 17 and 18 on the Control Board
(resistor is ±1%, minimum ¼ Watt).
Frames C-F drives are fitted with an integral resistor,
switched in and out by switch SW1 on the Control
Board.
IMPORTANT: Failing to use a terminating resistance may result in
unreliable operation.

6 ASCII
RS485/RS232 Communications Interface
System Recommendations
Note: It is possible to make serial communications operate without adhering to the following
recommendations, however, the recommendations will promote greater reliability.
•An RS485 two-wire system can only be used in a network in which all devices use their tri-
state capability. Data flow is restricted, i.e. transmit and receive cannot be simultaneous (half
duplex). The driver in an RS485 system has tri-state capability (i.e. its output can be
disabled) which allows multiple transmitters to be connected to the same bus. RS485 thus
supports “multi-drop” operation. In multi-drop systems there is always one device which is a
“Master” and which sends messages to or requests data from the “Slaves”. A Slave never
initiates a communication.
•An RS232 three-wire system always has a “Master” which sends messages to or requests
data from the “Slave”. The Slave never initiates a communication. There is only one
"Master" and one "Slave" in the system.
PLC/SCADA Supervisor
If possible, avoid using a PLC/SCADA supervisor which take its transmitter to a high
impedance state (tri-state) when idling. If it is unavoidable, then it is essential to use properly
screened cable.
RS485 Cable Specification
Use cable which has twisted pairs and
one overall screen, as shown. The
characteristic impedance should be in
the range 100 to 165 Ohms.
Recommended Cable Specification
Characteristic Impedance 100-165Ωat 3-20MHz
Cable Capacitance <30pF/m
Core Diameter 0.34mm² (22 AWG)
Cable Type Twisted pair cable
Resistance <110Ω/km
Shielding Copper braid, or braid & foil
Note: Belden 9841 cable meets the above specification, but there are others.
RS232 Cable Specification
There are no special requirements for RS232 cabling, but we do recommend a maximum length
of 3 metres between Master and Slave.
screen
insulation outer sheath
conductors
twisted pair

ASCII 7
RS485/RS232 Communications Interface
Initial Set-up for EI Bisynch ASCII
Configuring the Drive
Note:
The RS485/RS232 Communications
Interface can only be used on drives
using software version 4.1 or higher
(indicated on power-up, i.e. "r4.1").
You must configure the drive to your
system.
If you are using the keypad (MMI), the
parameters to edit are in the SERIAL
menu, SSE01 to SSE09.
If you are using ConfigEd Lite (or other
suitable PC programming tool) the
same parameters are contained in the
COMMS PORTS and COMMS
CONTROL function blocks.
ConfigEd Lite is Parker SSD Drives’
Windows-based block programming
software.
Note:
To view all parameters available on
the MMI, FULL menu detail must be selected in the DETAILED MENUS parameter (
ST
99):
1 = FULL.
Parameter Descriptions: COMMS PORTS
This function block configures the programming ports that allow connection to the keypad, or to
a personal computer.
The parameters below are used to identify the drive to the controlling software for drive
configuration and storage of parameters.
Note:
The unit will always respond to GID = 0 and UID = 0, as this is the “broadcast”
address used by the keypad.
GROUP ID (GID) Range: 0 to 7
The Parker SSD Drives protocol group identity address.
COMMS ADDRESS F
SET\SERL SE03 Range: 0 to 255
The Parker SSD Drives protocol unit identity address (UID) or the Modbus node address.
Note: if set to 0, it will only respond to broadcast messages.
BAUD RATE F
SET\SERL SE04 Range: Enumerated - see below
Selects the Baud Rate for the MODBUS protocol.
Enumerated Value : Baud Rate
0 : 1200
1 : 2400
2 : 4800
3 : 7200
4 : 9600
5 : 14400
6 : 19200
7 : 38400
8 : 57600
Comms Ports
0–[102] GROUP ID (GID) –
0–[103] COMMS ADDRESS –
9600 –[1062] BAUD RATE –
NONE –[1061] PARITY –
5–[1260] REPLY DELAY
AUTOMATIC –[1060] OP PORT PROTOCOL –
AUTOMATIC –[1059] P3 PORT PROTOCOL –
MODBUS –[117] RS485 PROTOCOL –
FALSE –[129] SWITCH OP PORT –
FALSE –[90] SWAP WORD ORDER –
Comms Control
–COMMS SEQ [295] –FALSE
–COMMS REF [270] –FALSE
–COMMS STATUS [272] –0
–COMMS COMMAND [273] –0
FALSE –[300] REMOTE COMMS SEL –
TERMINALS/COMMS –[307] REMOTE SEQ MODES –
TERMINALS/COMMS –[308] REMOTE REF MODES –
0.0 s –[309] COMMS TIMEOUT –

8 ASCII
RS485/RS232 Communications Interface
PARITY F
SET\SERL SE05 Range: Enumerated - see below
Selects the Parity for the MODBUS protocol.
Enumerated Value : Parity
0 : NONE
1 : ODD
2 : EVEN
REPLY DELAY F
SET\SERL SE06 Range: 0 to 200
The time in milliseconds between the drive receiving the complete request from the
communications master (PLC/PC) and replying to this request.
OP PORT PROTOCOL F
SET\SERL SE07 Range: Enumerated - see below
Selects the protocol to be used by the keypad port on the front of the drive. When EIBISYNC
ASCII is selected, BAUD RATE is 19200 and PARITY is EVEN.
Enumerated Value : Protocol
0 : AUTOMATIC - checks for keypad or EI ASCII
1 : KEYPAD
2:EIBISYNCASCII
3:MODBUS
4:FIELDBUS
P3 PORT PROTOCOL F
SET\SERL SE08 Range: Enumerated - see below
Selects the protocol to be used by the RS232 programming port on the drive's control board.
When EIBISYNC ASCII is selected, BAUD RATE is 19200 and PARITY is EVEN.
Enumerated Value : Protocol
0 : AUTOMATIC - checks for keypad or EI ASCII
1 : KEYPAD
2:EIBISYNCASCII
3:MODBUS
4:FIELDBUS
RS485 PORT PROTOCOL F
SET\SERL SE09 Range: Enumerated - see below
This parameter is not available on the 650V Frame 1, 2 & 3. For these frame sizes, use
"OP PORT PROTOCOL" to select the protocol for the comms option.
Selects the protocol to be used by the RS485 programming port on the drive's control board.
Enumerated Value : Protocol
0 : AUTOMATIC
1 : KEYPAD (not applicable)
2:EIBISYNCASCII
3:MODBUS
4:FIELDBUS
SWITCH OP PORT F
SET\SERL SE10 Range: FALSE / TRUE
This parameter is not available on the 650V Frame 1, 2 & 3.
When TRUE, the keypad port on the front of the drive is disabled when the communications
equipment is connected to the RS232 programming port on the drive's control board.
When FALSE, the RS485 programming port is disabled when the communications equipment is
connected to the RS232 programming port. Both ports are on the drive's control board.
SWAP WORD ORDER Range: FALSE / TRUE
Controls the word order used with 32-bit data access with the Modbus RTU protocol.

ASCII 9
RS485/RS232 Communications Interface
Parameter Descriptions : COMMS CONTROL
This block switches between Remote Terminal and Remote Comms operating modes.
The drive must be in Remote operating mode for selection to be made - REMOTE mode is
enabled in the LOCAL CONTROL function block (REF MODES) or selected by the keypad.
REMOTE COMMS SEL SET\SERL SE01 Range: FALSE / TRUE
Selects the type of remote communications mode:
0 : FALSE, and in REMOTE mode then control is from the terminals.
1 : TRUE, and in REMOTE mode then control is from the communications.
REMOTE SEQ MODES Range: Enumerated - see below
Selects the type of remote sequencing mode:
Enumerated Value : Mode
0 : TERMINALS/COMMS
1 : TERMINALS ONLY
2 : COMMS ONLY
REMOTE REF MODES Range: Enumerated - see below
Selects the type of remote reference mode:
Enumerated Value : Mode
0 : TERMINALS/COMMS
1 : TERMINALS ONLY
2 : COMMS ONLY
COMMS TIMEOUT SET\SERL SE02 Range: 0.0 to 600.0 s
Sets the maximum time allowed between refreshing the COMMS COMMAND parameter. The
drive will trip if this time is exceeded. Set the time to 0.00 seconds to disable this feature.
COMMS SEQ Range: FALSE / TRUE
Diagnostic indicating if operating in Remote Sequencing Comms Mode.
If FALSE (0), the drive may be in Local Sequencing mode or Remote Sequencing Terminal
mode.
COMMS REF Range: FALSE / TRUE
Diagnostic indicating if operating in Remote Reference Comms Mode.
If FALSE (0), the drive may be in Local Reference mode or Remote Reference Terminal mode.
COMMS STATUS Range: 0000 to FFFF
Diagnostic showing the 16-bit Status word as seen by the communications.
Refer to Chapter 4: “Sequencing Logic” in the 650 or 650V Software Product Manual.
COMMS COMMAND Range: 0000 to FFFF
Diagnostic showing the 16-bit Command as written by the communications.
Refer to Chapter 4: “Sequencing Logic” in the 650 or 650V Software Product Manual.

10 ASCII
RS485/RS232 Communications Interface
Configuring the PLC/SCADA Supervisor
By referring to the Parameter Specification Table in the 650 or 650V Software Product Manual,
you can enter the parameter information you require.
It provides the information in the following way:
Type
The first page of the Parameter Specification Table chapter details parameter types.
The Type column indicates each parameter's type.
ID
The ID column provides the parameter mnemonic (of the tag number).
Example only

ASCII 11
RS485/RS232 Communications Interface
ASCII Communications
Note:
The RS485/RS232 Communications Interface supports EI Bisynch ASCII only, not Binary.
What Information Can I Transfer?
The data transfer sequence in the ASCII mode offers the following facilities:
i) Parameter enquiry (known as polling)
a. Single Parameter Poll
b. Continuous Polling of a Parameter
c. Sequential Polling (fast polling down the parameter list)
ii) Setting parameters (known as selection)
a. Single Parameter Selection
b. Continuous Selection of a Parameter
c. Sequential Selection (fast selection down the parameter list)
Note: For examples of all the above refer to “Transferring Data - ASCII Example Messages”,
page 19.
How is the Information Transferred?
There are two types of data transfer message:
1. Reading information from the Drive
2. Writing information to the Drive
In both cases the supervisor must have an established connection with the device, which will
then respond. The role of master and slave exchanges during the transfer.
A message consists of a sequence of characters which we identify as
•Control Characters
•Instrument Address
•Parameter Mnemonic
•Data
Note: Refer to “EI Bisynch ASCII Message Protocol” page 14, where these four types of
character are discussed in detail.
The following events take place in transmitting a successful message:
•Establish Connection
•Enquiry or Set Parameter
•Response
•Further Transmission and/or Termination
Establish Connection
Connection is established with a particular device by sending its two-digit address (i.e.
INSTRUMENT ADDRESS as above). This comprises the GROUP ID (GID) - first digit, and
the COMMS ADDRESS (SE03) - second digit.
Note:
The GROUP ID (GID) parameter is not available on the keypad and so the first digit is
always "0" when using only the keypad. Over the Comms, it can be set from 0 to 7.
Enquiry or Set Parameter
The message is either an enquiry (reading information from the Drive), or a message to set a
parameter (writing information to the Drive).

12 ASCII
RS485/RS232 Communications Interface
Response to a `Set Parameter’ Message
The Drive will respond to a Set Parameter message in one of three ways:
1. Positive Acknowledgement (ACK)
2. Negative Acknowledgement (NAK)
3. No Reply: Under certain circumstances the supervisor may not receive a reply from the
Drive. This could be due to any of the following reasons:
•Group/Unit address
identifiers not
recognised.
•An error (e.g. parity)
is found in one or
more of the
characters up to and
including (ENQ).
•Communications
loop failure perhaps
due to noise or
wrong Baud Rate
being selected.
•Hardware failure.
•Serial link is
disabled on the
Keypad.
In these cases the
supervisor should be
programmed to "time-
out", i.e. wait for a
response for a short
time (160 msec
minimum) before trying
again.
Figure 1 Drive Response Sequence to an ASCII Selection Message
Further Transmission and/or Termination
Further Transmission
If the supervisor still has an established connection with the device, you can repeat the previous
message without re-establishing connection.
In both cases, writing to or reading from the device, you can use this to re-select the previous
parameter or to select the next parameter in the parameter list. Refer to “Transferring Data -
ASCII Example Messages”, page 19 for further explanation.
Termination (EOT)
If you wish to terminate connection with a particular device and establish connection with
another, send the 'Establish Connection' sequence preceded by the (EOT) control character,
(End Of Transmission).
The (EOT) character resets all devices on the data link to be responsive to the next four
characters, i.e. the (GID)(GID)(UID)(UID) address.
In 2-wire operation, an (EOT) can only be sent when the supervisor has Master status.
SEND
MESSAGE
PARITY CHECK
VERIFY CHECKSUM (BCC)
VERIFY THAT (C1) (C2)
ARE A VALID MNEMONIC
AND CAN BE WRITTEN TO
OK
OK
FAIL
FAIL
FAIL
FAIL
OK
MESSAGE
RECEIVED
VERIFY DATA (D1)..(Dn)
IS VALID AND NOT
OUT-OF-RANGE
OK
FAIL
(NAK)
NEGATIVE
ACKNOWLEDGEMENT
(ACK)
POSITIVE
ACKNOWLEDGEMENT
UPDATE THE
SELECTED PARAMETER
WITH THE NEW VALUE
CONTAINED IN THE
MESSAGE
No Reply
OK

ASCII 13
RS485/RS232 Communications Interface
Programmer’s Information
ASCII (American Standard Code for Information Interchange)
The RS485 Option communicates using ASCII, a binary code which represents letters, digits,
and control signals (collectively called characters).
The code, originated by the American National Standards Institute (ANSI), has become a world-
wide standard for information interchange. It uses a seven bit binary word to represent all the
letters, digits, punctuation marks and control signals.
Handling of Numerical Data
(Format 21 - Free Format Numeric)
Numerical Data is transferred as a string of characters. The drive will accept any format but will
transmit an interpreted value that always contains a decimal point, and with no trailing zeros i.e.
1.00, 1.0, 1. or 1 is interpreted as 1.
-2.20 or -2.2 is interpreted as -2.2
Handling of Status Information
(Format 23 - Hexadecimal)
Status Information is transmitted by first encoding the data into a hexadecimal format. The
length of a string is then determined by the number of characters in the encoded data. The
hexadecimal data is preceded by a ‘>‘ sign to differentiate it from numerical data.
Note: Hexadecimal refers to the common practice of counting to the base of 16 in computing
rather than the base of 10. The sixteen `numbers’ used being 0 to 9, A to F. Thus an 8
bit byte is represented by two characters in the range 00 to FF, while a 16 bit word is
represented by four characters in the range 0000 to FFFF.
Block Check Character (BCC)
This is a checksum value generated by taking the exclusive OR (XOR) of the ASCII values of
all the characters transmitted after and excluding (STX) up to and including (ETX). For
example, the shaded characters are included in the (BCC) of the following message:
(EOT) (GID) (GID) (UID) (UID) (STX) (C1) (C2) (D1) (D2) (D3) (D4) (D5 (ETX) (BCC)
Example 1: EI Bisynch Prime Set
For Beginners:
You can calculate this easily by converting the ASCII values to
Binary and progressively adding the Binary values together,
obeying the following rules:
Referring to Example 1 on page 23, the calculation of (BCC) becomes:
As Characters HEX ASCII Binary
(C1) 49 I 0 1 0 0 1 0 0 1
(C2) 49 I 0 1 0 0 1 0 0 1
(D1) 3E > 0 0 1 1 1 1 1 0
(D2) 32 2 0 0 1 1 0 0 1 0
(D3) 36 6 0 0 1 1 0 1 1 0
(D4) 35 5 0 0 1 1 0 1 0 1
(D5) 30 0 0 0 1 1 0 0 0 0
(ETX) 03 (ETX) 0 0 0 0 0 0 1 1
(BCC) 3C < 0 0 1 1 1 1 0 0 (TOTAL)
0
0
0
+1
1
0
+1
0
1
+0
1
1
+