4 configuration remarks, Modbus communication modules – Xylem 205546 Modbus Communication Modules for Displays User Manual
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EN 6.81 Modbus Communication Module 205546 Manual 1212
2.1.4 Configuration Remarks
• The connected units on the Modbus have unique assigned IDs built as
follows:
SRO modbus ID = Instrument modbus ID + modbus ID offset
• ID 0 (broadcast) cannot be used (a broadcast is used for synchronous
transmission of messages to all connected units).
• Available registers are limited to the measured value registers of the indi-
vidual units. Configuration settings cannot be accessed.
• The PLC time-out on the Modbus must be set to 5 seconds from the
SCADA system or the master PLC unit.
• COM module configuration/setup is executed from the “Display Setup/
Communication” menu (see below).
• The “Communication” option in the display menu automatically appears,
when a communication module is connected to the display.
Display Setup
Language
Set Clock
Modbus
Factory settings
Display SW version
Communication
Back
Select
OK
Communication
Baud rate
Parity
Stop bits
Modbus ID offset
Back
Select
OK
Baud rate
300
1200
4800
9600
19200
38400
57600
115200
Back
Select
OK
Parity
Even
Odd
None
Back
Select
OK
Stop bits
1
2
Back
Select
OK
Modbus ID offset
000
Back
Select
>
7 - Display Modbus_RS485 Com Module menu
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8. februar 2010
Default:
9600
Even
1
000
Figure 2. COM Module Configuration
Modbus Communication Modules