Comtech EF Data SDM-300A - Manual (Page 303)

SDM-300A Satellite Modem Revision 6
ASYNC/AUPC Interface MN/SDM300A.IOM
11–21
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.
#7. 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.
#7. 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.
#7. Remote End EIA-232
9-Pin
Male Connector
25-Pin
Male Connector
RX 2 2 RX
TX 3 3 TX
GND 5 7 GND