SGW1-IA3-MMP – Modbus Multiplexer
Exemys
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SGW1-IA3-MMP User’s Manual Rev. 1
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4.3
Converter Mode
In this mode of use the SGW1-IA3-MMP functions as a Modbus protocol converter,
converting from Modbus ASCII to Modbus RTU and vice versa. It can also function as an
RS232 / RS485, parity, stop bit and / or baud rate converter.
4.4
Interchange memory Mode
This feature allows Modbus masters connected to the device to exchange information
between them by reading and writing a memory area of the SGW1-IA3-MMP intended for
this purpose. This mode can be used in conjunction with the multiplexer mode.
The exchange records range from 40001 to 41000 (Holding Registers)
The Modbus ID number of the internal slave is 240. It can be modified through the
INTSLVID
command.
•Example 1: A master connected to Port A, henceforth Master A, needs to read 50 registers
(Holding Register) of the master connected to Port B, henceforth Master B, and in turn
Master B needs to read 100 registers (Holding Register) of master A.
For this we must configure master A to read registers 40001 to 40050 of slave # 240 and to
write registers 40051 to 40150 with the information that master B needs. In the same way,
set up master B to read registers 40051 to 40150 of slave # 240 and to write registers 40001
to 40050 with the information that master A needs
