Comtech EF Data SDM-300A User Manual
Page 305
SDM-300A Satellite Modem
Revision 6
ASYNC/AUPC Interface
MN/SDM300A.IOM
11–23
The local end cable connects the 25-pin female ASYNC connector (on either the
breakout panel or the Y cable) to the EIA-485 (2-wire) remote terminal (WYSE or laptop
computer). The pinout of the local cable is listed in the following table.
#8. Local End EIA-485 (2-Wire)
9-Pin
Female Connector
25-Pin
Male Connector
TX/RX+ 4
14,
16
TX+/RX+
TX/RX+ 5
2,
3
TX-/RX-
In addition, the following table lists the pinout for the WYSE terminal cable using an
EIA-232 to EIA-485 converter.
#8. Local End WYSE Cable With Converter
25-Pin
Male Connector
9-Pin
Male Connector
TX-/RX- 2,
5 5 TX/RX-
TX+/RX+ 14,
17 4 TX/RX+
(See Note)
18, 21
Note: Disables RD during TD.
The remote end cable connects the 25-pin female ASYNC connector (on either the
breakout panel or the Y cable) to the 9-pin female connector, J6, at the rear of the
modem. The pinout of the remote cable is listed in the following table.
#8. Remote End EIA-485 (4-Wire)
Twisted Pair
9-Pin
Male Connector
25-Pin
Male Connector
TX+ 4 16 RX+
TX- 5 3 RX-
RX+ 8 14 TX+
RX- 9 2 TX-