Comtech EF Data CSAT-6070 - Manual (Page 102)

5 to 25 Watt C-Band Transceiver Revision 0
Redundant Systems MN/CSAT607025.IOM
B.3.1 EIA-485 I
NTERFACE
The RSU-5060 provides a single point interface for the Customers M&C system by pig tailing the
4-wire EIA-485 input to J5 and passing it out on both the J1 and J3 interface connectors. When
using the EIA-485, 4-wire interface to talk to the individual CSAT’s are addressed at subsequent
addresses through the use of the ‘B SELECT *’ signal going to CSAT B on the J3 interface
connector. To set or change the address of both units, uses the SPA=XXXX command defined in
sections 3 and 4 in conjunction with the global address 0000
.
Example: To set the two CSAT’s to addresses 0064 and 0065 send the following command:
<0000/SPA=0064’cr’
B.3.2 RED AUTO/MANUAL
SIGNAL
Pin P on the J5 connector is the ‘RED AUTO/MANUAL’ input pin. The user can use this signal
to control the operating mode of the RSU-5060. If this pin is left open, the RSU-5060 is operated
in the AUTO mode. In AUTO mode, the RSU-5060 monitors the state of CSAT A and CSAT B
via the ‘A/B FAULT N.O.’ signals on the J1/J3 connectors. If the ONLINE unit fails, the RSU-
5060 will automatically command both the Tx and Rx transfer switches to change position.
Note: If the OFFLINE unit also is FAULTED, no switchover will occur.
The ‘RED AUTO/MANUAL’ signal has a corresponding REMOTE COMMAND, “RAM=X”.
This command, defined in section 4, can be used to control the operating mode of the RSU-5060
assuming that Pin P is left open. (Note: Grounding Pin P forces the RSU-5060 into MANUAL
mode independent of the “RAM=X” remote command.
B–8