Comtech EF Data RCU101 User Manual
Page 17
RCU101 1:1 Protection Switch
Installation
TM055 - Rev. 2.2
Page 2-7
Operator Serial I/O Connector (Rear Panel)
J8 DB 9 Pin#
RS232
RS422/485
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 outlined in Appendix C. A summary of
jumper selections is as follows:
Configuration JP4-1
JP4-2
JP4-3
JP4-4
JP4-5
JP4-6
JP3
JP5
JP6
JP7
JP8
RS232
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
IN
OUT
OUT
RS422
IN
IN
IN
IN
OUT
OUT
OUT*
OUT
OUT OUT
IN
RS485
IN
IN
IN
IN
OUT
OUT
OUT*
OUT
OUT OUT
IN
485 1/2 DPLX
IN
OUT
OUT
IN
OUT
OUT
OUT*
IN
OUT IN
IN
*Receiver terminations for twisted pair RS422/485 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.
2.4.6
Up/Downconverter Equipment RS485 Port (J6 on Converter Rear Panel)
An equipment multi-drop, full-duplex, bi-directional RS485 Interface allows communication
between converters. Because the RS485 interface uses a master/slave (talker/listener)
configuration, the converter that is designated the backup converter will automatically be
established as the master. Under normal RS485 protocol, the master will poll a specific slave by
address and only then will the slave unit respond. The swapping of Transmit Data and Receive
Data is accomplished in the inter-converter cable as the hardware interface is identical for all
converters.