COMMUNICATION MULTI GAUGE CONTROLLER
6.3 COMMUNICATION INTERFACES
Serial communication is possible in different standards. Depending on the protocol chosen, there
are different communication connections. Descriptions of the connections for individual protocols
are presented below.
The RS232/RS485, ETH and Proinet ports of the MG15 are not optically iso-
lated. Therefore, it is necessary to ensure the same potentials between the con-
troller(s) and other devices in this bus (common power supply chassis ground).
Otherwise problems with communication and even damage to the device may
occur.
6.3.1 RS232/RS485 CONNECTOR
Figure 6.3: Female socket of RS232/RS485 (Modbus RTU) interface
PIN NUMBER FUNCTION DESCRIPTION
2 RX RS232 - Data reception signal from the device
3 TX RS232 - Data transmission signal to the device
5 C (GND) Common signal (ground)
8 A+ RS485 - Data signal (positive)
9 B- RS485 - Data signal (negative)
1,4,6,7 N/C Not connected
Table 6.1: Pins description of ”RS232/RS485” connector
Page 84 User manual rev. 03
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