Comtech EF Data SMS-451 - Manual (Page 57)

SMS-451T 1:1 ESC Protection Switch Revision 0
B-141-1 Interface Breakout Panel MN/SMS451.IOM
A–5
A.2.2 8 kbps RS-422 Interface (P2)
The 8 kbps RS-422 interface is provided on a 37-pin female D connector accessible from
the front of the breakout panel. Screw locks are provided for mechanical security of the
mating connector.
Signal Function Name Pin #
GROUND GND 1, 19, 20, 37
1KHZ TX OCTET TXO-A
TXO-B 3
21
8KBIT TX DATA TXD-A
TXD-B 4
22
8KHZ TX CLOCK TXC-A
TXC-B 5
23
8KBIT RX DATA RXD-A
RXD-B 6
24
REQUEST TO SEND/
CLEAR TO SEND RTS_CTSB
RTS_CTSA 25, 27
7, 9
8KHZ RX CLOCK RXC-A
RXC-B 8
26
1KHZ RX OCTET RXO-A
RXO-B 15
33
Note: RTS and CTS are looped together on the connector.
A.2.3 Alarm Outputs (TB1)
The alarm outputs are provided on an 8-position terminal block located on the front panel
of the breakout panel.
Signal Function Name Pin #
GROUND GND 1
DEMOD FAULT RELAY DF-COM
DF-NO 2
3
BACKWARD ALARM INPUT BWI-1
BWI-2
BWI-3
BWI-4 4
5
6
7
DEFERRED MAINTENANCE ALARM DMA 8