3Com External PoE Power System PSE2500-A3 - Manual (Page 16)

User Manual
PSE2500-A3 External PoE
Power System
Chapter 2 System Description
2-5
command the operation through equipment which has RS232 or
RS485 interface and can support this protocol.
There is one RS485 port and one RS232 interface on the rear
panel.
Their definitions are as follows:
Table 2-2 RS232
Pin Definition
1 Not used
2 Receive
3 Transmit
4 Not used
5 Ground
6 Not used
7 Not used
8 Not used
9 Not used
Table 2-3 RS485
Pin Definition
1 Transmit, +
2 Transmit, -
3 Receive, +