Comtech EF Data UT-4579 - Manual (Page 27)

UT4579 X-Band Up Converter MN/UT4579.IOM
Installation Rev. 0
11
2.4.2 EIA-485/EIA-232C I
NTERFACE
(COM 1), C
ONNECTOR
J1
The EIA-485/EIA-232C Interface connector, J1, is 9 pin "D" type DB9F connector
socket. The pin-out specifications for EIA-485 are contained in Table 3 and Table 4. The
specification for EIA-232C is contained in Table 5. The mating connector is a DB9M.
Table 3. J1, 2 Wire EIA-485 Interface Pin-Out Table 4. J1, 4 Wire EIA-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 5. J1, EIA-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