Comtech EF Data CRS-400 - Manual (Page 37)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
21
2.6.6 A UXILIARY S ERIAL C ONNECTOR / P ASS -T HROUGH
This connector is used for switch remote control of each SDM-2020 modulator or
demodulator. This remote communication is fixed at a rate 19200 Baud with 7-E-2
character format. Ensure that each mod/demod is set for EIA-485 4-wire communications
and the matching protocol and baud rate.
The pinout for EIA-485 communication at the switch is the same as the remote control on
the SDM-2020 modems. Table 2-5 provides the pinout information.
Table 2-5 Auxiliary Serial Connector/Pass-Through, Cable # PL/9195-1
CRS-400
9-Pin D
Male Description VO
9 EIA-485 Receive Data B I
8 EIA-485 Receive Data A I
5 EIA-485 Transmit Data B O
4 EIA-485 Transmit Data A O
1 Ground
2 Not connected
3 Not connected
6 Not connected
7 Not connected