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PDF RS232 Data sheet ( Hoja de datos )
| Número de pieza | RS232 | |
| Descripción | Communications Interface | |
| Fabricantes | EUROTHERM DRIVES | |
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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.
1 page  
ASCII
1
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
5 Page 
ASCII
Initial Set-up for EI Bisynch ASCII
7
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 Eurotherm Drives’
Windows-based block programming
software.
FALSE
TERMINALS/COMMS
TERMINALS/COMMS
0.0 s
Comms Control
– COMMS SEQ [295] –
– COMMS REF [270] –
– COMMS STATUS [272] –
– COMMS COMMAND [273] –
– [300] REMOTE COMMS SEL –
– [307] REMOTE SEQ MODES –
– [308] REMOTE REF MODES –
– [309] COMMS TIMEOUT
–
FALSE
FALSE
0
0
0
0
9600
NONE
5
AUTOMATIC
AUTOMATIC
MODBUS
FALSE
Comms Ports
– [102] GROUP ID (GID)
– [103] COMMS ADDRESS
– [1062] BAUD RATE
– [1061] PARITY
– [1260] REPLY DELAY
– [1060] OP PORT PROTOCOL
– [1059] P3 PORT PROTOCOL
– [117] RS485 PROTOCOL
– [129] SWITCH OP PORT
–
–
–
–
–
–
–
–
Note: To view all parameters available on the MMI, FULL menu detail must be selected in the
DETAILED MENUS parameter ( ST99): 1 = FULL.
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.
RS485/RS232 Communications Interface
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RS232.PDF ] | |
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