Comtech EF Data DT-4500 Series - Manual (Page 39)

DT4500 Series Down Converters MN/DT4500.IOM
Installation Revision 1
21
2.4.2 RS-485/RS-232C I
NTERFACE
(COM 1), C
ONNECTOR
J1
The RS-485/RS-232C Interface connector, J1, is 9 pin "D" type DB9F connector socket.
The pin-out specifications for RS-485 are contained in Table 7 and Table 8. The
specification for RS-232 is contained in Table 9. The mating connector is a DB9M.
Table 7. J1, 2 Wire RS-485 Interface Pin-Out Table 8. J1, 4 Wire RS-485 Interface Pin-Out
Pin # Description
1 GND; Ground
2
3
4 +RX/TX; Signal
5 -RX/TX; Signal Complement
6
7
8 +RX/TX; Signal
9 -RX/TX; Signal Complement
Pin # Description
1 GND; Ground
2
3
4 +TX; Signal
5 -TX; Signal Complement
6
7
8 +RX; Signal
9 -RX; Signal Complement
Note: Pins 8 & 9 are the loop to the next
converter.
Table 9. J1, RS-232C Interface Pin-Out
Pin # Description
1
2 TD; Transmit Data
3 RD; Receive Data
4
5 GND; Ground
6 DSR; Unit Ready - always high.
7 RTS; Request to Send. Looped to CTS.
8 CTS; Clear to Send
9