MNC-0300-021
18 of 20
Revision D
Unpacking and Installation, Rack SSPA
COM2 RS-485 Interface (J6) (DE-9 Pin)
This port is used by the customer to connect to a remote RS-485
port. This port may be either a 2-wire or 4-wire port. Table 5 lists the
pinouts for COM2. Figure 6 and Figure 7 show the 2-wire and 4-wire
implementation.
Figure 6, Typical RS-485 2-Wire Duplex Implementation
Table 5, COM2 RS-485 Pinouts
Pin No
2-Wire System
4-Wire System
1
(-) Data
(-) Transmit Data
2
(-) Data
(-) Receive Data
3
No Connection
No Connection
4
No Connection
No Connection
5
Ground
Ground
6
(+) Data
(+) Transmit Data
7
(+) Data
(+) Receive Data
8
No Connection
No Connection
9
No Connection
No Connection
