Communication Interface Connection; Switchgear Bus Network; M10X-M Motor Controller; Figure 10 Hardware Connection Between Digital Gateway And M10X-M - ABB LVS Digital Manual

S WITCHG EAR B US NET WORK
—

5. Communication Interface Connection

5.1. Switchgear Bus Network

M10x-M motor controller

The communication between Digital Gateway and M10x is established via Modbus RTU proto-
col.
Modbus RTU is a single master/multiple slave type of protocol which is suitable for a multi
drop wiring installation as supported by RS485 hardware. In this case, M10x-M device acts as
a Modbus slave while Digital Gateway acts as a Modbus master.
RS485 is a balanced two-wire transmission and multi-drop system. RS485 supports 32 de-
vices (one master and 31 slave devices) over distance up to 1.2 km in a single segment. 120
Ohm resistors are required as terminators for both end of each communication link. The Digi-
tal Gateway has an inbuilt terminating resistor on its serial port which acts as a first point,
while for the last point, one 120 Ohm resistor needs to be installed

Figure 10 Hardware connection between Digital Gateway and M10x-M

The settings required in M10x to establish the communication between M10x and Digital
Gateway are the device address, baud rate, Modbus stop bit and Modbus parity check. The
following table shows the setting required for the M10x communication.
Baud Rate
9600
19200 (to be used along with
EMax ACB)
38400 (default)
57600*
*57600 Baud shall be set for max. data throughput but installation has to be handled with care and max. stub
length of communication cables have to be considered for reliable communication !

Table 6 M10x Communication setting

1 8
COM MU NI CAT IO N I NT ERFACE CONNECTI ON
Stop Bit
1
Parity Check
Even
1 TG C90 80 04