9 operation serial i/o (j8) – Comtech EF Data SFC4200 User Manual
Page 54
Electrical Interfaces
SFC4200/SFC1275G Synthesized Frequency Downconverter
5-4
TM054 - Rev. 4.0
5.9 Operation Serial I/O (J8)
The Operation Serial I/O Port (J8) is a D Sub 9-Pin Female Connector. This port provides a
serial interface that can be configured as either an RS-232, RS-422 or RS-485 interface and
allows the user to remotely control all of the features outlined in the Serial Protocol. The serial
port comes configured as an RS-232 Serial Port for DCE unless indicated otherwise. The
pinouts of the D-Sub 9-Pin Socket Connector configured for RS-232 or RS-422/-485 is listed in
Table 5-4.
Table 5-4. J8 – Operation Serial I/O Port – D Sub 9-Pin Connector
Pin No.
RS-232
RS-422/-485
AS/3048
(J10)
1
N/C
RXData\
1
2
TXData
TxData
3
3
RXData
RxData
5
4
DTR to Pin 6
DTR to Pin 6
7
5
GND
GND
9
6
DSR to Pin 4
DSR to Pin 4
2
7
RTS to Pin 8
RTS to Pin 8
4
8
CTS to Pin 7
CTS to Pin 7
6
9
N/C
TxData\
8
Note: In order to obtain these signals at the output connector, the jumper configuration
on the AS/3048 Controller PWB must have been performed as illustrated in Figures 5-4
through 5-7. A summary of the jumper selections is as follows:
Configuration
JP4-1 JP4-2
JP4-3 JP4-4 JP4-5
JP4-6
JP3
JP5
JP6
JP7
JP8
RS-232
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
IN
OUT
OUT
RS-422
IN
IN
IN
IN
OUT
OUT
OUT
*
OUT
OUT
OUT
IN
RS-485
IN
IN
IN
IN
OUT
OUT
OUT
*
OUT
OUT
OUT
IN
RS-485 1/2 DPLX
IN
OUT
OUT
IN
OUT
OUT
OUT
*
IN
OUT
IN
IN
* Receiver terminations for twisted pair RS-422/-485 can be optionally terminated at 120
Ohms by installing JP3. Factory-supplied cables for multiple converter "daisy chain"
operation are terminated at the cable ends.
The serial protocol is designed to provide DTE-to-DCE Point-to-Point Communications. The
converter is wired as the DCE to provide an interface to a dumb terminal (DTE) without a null
modem connection. Because the serial protocol uses unique addressable commands, the
converters are capable of providing multipoint communications between a number of converters
and a customer-supplied serial interface. The typical multipoint communications configurations
include full- and half-duplex RS-485. In addition, a multipoint RS-232 interface is also possible.