Rs-485 Serial Ports - PowerLogic EGX200 Instruction Bulletin

Chapter 4—Installation and Wiring
Wiring Connections

RS-485 Serial Ports

The RS-485 serial ports are used to communicate with daisy-chained devices. The
EGX200 has two serial ports: COM 1 is always set for RS-485 communication, and
COM 2 is selectable between RS-485 and RS-232. By default, COM 2 is set for
RS-485 communication. For more information on configuring COM 2, please refer to
the Communications Settings web page on page 31.
Each port is designed to support up to a maximum of 32 devices without a repeater
(see Figure 4–6). The RS-485 ports enable communications via a 4-wire plus shield or
2-wire plus shield cable (Tx+, Tx–, Rx+, Rx-, and
Figure 4–6: Daisy Chain Connected to EGX200 RS-485 Port
For communication wiring, we recommend the following cables:
• For 4-wire communication, use Belden 8723 or 9842 cable or equivalent.
• For 2-wire communication, use Belden 9841 cable or equivalent.
22
POWERLOGIC
System Manager Software (SMS)
ETHERNET
EGX200
RS-485 Daisy Chain Connected to the EGX200 RS-485 Port
).
© 2001 Schneider Electric All Rights Reserved
63230-314-200/A2
8/2001