RS232 Datasheet PDF - EUROTHERM DRIVES
Part Number | RS232 | |
Description | Communications Interface | |
Manufacturers | EUROTHERM DRIVES | |
Logo | ||
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Preview 1 page No Preview Available ! RS485/RS232
Communications
Interface
Technical Manual
HA466357U001 Issue 3
EUROTHERM
DRIVES
Compatible with Version 4.x Software
Copyright Eurotherm Drives Limited 2002
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 Eurotherm Drives company without written permission from Eurotherm
Drives 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. Eurotherm Drives cannot accept responsibility for damage, injury, or expenses
resulting therefrom.
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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.
Advantages with this type of control 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).
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 Eurotherm 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.
Protocols
Note:
EI Bisynch ASCII/Binary
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.
RS485/RS232 Communications Interface
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