Eia-485/Eia-232C Interface (Com 1), Connector J1; Table 3. J1, 2 Wire Eia-485 Interface Pin-Out; Table 4. J1, 4 Wire Eia-485 Interface Pin-Out; Table 5. J1, Eia-232C Interface Pin-Out - Comtech EF Data DT-4572 Installation And Operation Manual

DT4572 X-Band Down Converter
Installation
2.4.2 EIA-485/EIA-232C I
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

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
Note: Pins 8 & 9 are the loop to the next converter.
(COM 1), C
NTERFACE

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
ONNECTOR

Table 4. J1, 4 Wire EIA-485 Interface Pin-Out

Pin # Description
1 GND; Ground
2
3
4 +TX; Signal
5 -TX; Signal Complement
6
7
8 +RX; Signal
9 -RX; Signal Complement
11
Rev. 0
MM/DT4572.IOM
J1