Comtech EF Data XTRT-400C Operation And Installation Manual page 56

Pin No.
MNC-0300-070
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COM1 is an RS-232 only serial interface. The configuration for
COM1 is done via the set-up menu on the front panel. Table 6,
RS-232 Pinouts, lists the pinouts for COM1.
Table 6, RS-232 Pinouts
Pin No.
1 No Connection
2 RXD—Received Data (from Controller)
3 TXD—Transmitted Data (to Controller)
4 No Connection
5 Ground and Signal Return
6 No connection
7 RTS—Request to Send (Amplifier)
8 CTS—Clear to Send (Amplifier)
9 No Connection
COM2 can be configured (via the set-up menu) as an RS-485
2-wire serial interface or as an RS-485 4-wire serial interface.
The pinouts for the COM2 interface are listed in Table 7, Pinouts
for the COM2 Intereface, and typical implementations are shown
in Figure 9, Typical RS-485 2-Wire Duplex Implementation and
Figure 10, Typical RS-485 4-Wire Full Duplex Implementation.
Table 7, Pinouts for the COM2 Intereface
RS-485 2-Wire System
1 (-) Data
2 (-) Data
3 No Connection
4 No Connection
5 Ground
6 (+) Data
7 (+) Data
8 No Connection
9 No Connection
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Unpacking and Installation
Function
RS-485 4-Wire System
(-) Transmit Data
(-) Receive Data
No Connection
No Connection
Ground
(+) Transmit Data
(+) Receive data
No Connection
No Connection
Revision 1