Installing The Serial Communication Cable For Rs485 Spa/Iec; Rs485 Serial Communication Module - ABB REB 551-C3*2.5 Installation And Commissioning Manual

5
5.1
Installing the serial communication cable for
RS485 SPA/IEC
Installing the serial communication cable for
RS485 SPA/IEC

RS485 serial communication module

Up
A
B
1)
1)
1)
GND
en03000109.vsd
Where:
A Signal A
B Signal B
1) Do not use
GND Ground
Figure 8: Pin arrangement on modem terminal. Baud rate: 9600
The distance between earth points should be < 100 m, see
connected to the protective earth at the terminal. The inner and outer shieldings are connected
to the protective earth at the external equipment. Use insulating tape for the inner shield to pre-
vent contact with the protective earth. Make sure that the terminals are properly earthed with as
short connections as possible from the earth screw, for example to an earthed frame.
The terminal and the external equipment should preferably be connected to the same battery.
Chapter 5
Installing the terminal
figure 9. Only the outer shielding is
37