Comtech EF Data XSAT-7080 - Manual (Page 66)

XSAT7080 X-Band Transceiver Revision 0
Redundant Systems MN/XSAT7080.IOM
5-10
5.3.3 SWITCH CMD
SIGNAL
Pin V on the J5 connector is the ‘SWITCH CMD’ input pin. The user can use this signal to
command the RSU-5060 to change the position of both the Tx and Rx transfer switches. This pin
should normally be left OPEN and momentarily shorted to ground to force a switch over
(minimum pulse width for this signal is 100 mS). The RSU-5060 operating mode does effect
how it will respond to the ‘SWITCH CMD’ command.
• If the operating mode is AUTO, a momentary short to ground on Pin V will cause the
RSU-5060 to change the position of the Tx and Rx transfer switches only if the currently
OFFLINE unit is not faulted.
• If the operating mode is MANUAL, a momentary short to ground on Pin V will always
cause the RSU-5060 to change the position of the Tx and Rx transfer switches. Like the
‘RED AUTO/MANUAL’ signal above, the ‘SWITCH CMD’ also has a corresponding
REMOTE COMMAND, “RTG=”. This command, defined in Appendix A, has the same
effect as a momentary short to ground on Pin V.
5.3.4 REDUNDANCY A/B
SIGNALS
Pin S on both J1 and J3 connectors are used to tell the XSAT’s that they are in a redundant
configuration.
5.3.5 REDUND_FLT
SIGNAL
Pin F on both J1 and J3 connectors are output signals from the RSU-5060 to the XSAT’s to
provide status indication to the XSAT’s regarding the operating condition of both the RSU-5060
and the two transfer switches. This signal is normally a one-half hertz square wave. If this signal
goes away, the ONLINE XSAT will use the AUXCOM (RS232) interface to the RSU-5060 to get
more information regarding the problem at hand. This information is available to the user via the
“RRS?” query described in Section 4.
5.3.6 AUXCOM
SIGNALS
Pins H and J on both the J1 and J3 connectors are the RS-232 RD and RS-232 TD signals
respectively. The AUXCOM interface is used solely in conjunction with the RSU-5060, and
should not be confused with the ‘Customers EIA232’ interface available on the XSAT J5
connector (pin E and F). The AUXCOM interface is used by the ONLINE XSAT to ascertain
information from the OFFLINE XSAT as well as the RSU-5060.