Comtech EF Data SDM-300A - Manual (Page 297)

SDM-300A Satellite Modem Revision 6
ASYNC/AUPC Interface MN/SDM300A.IOM
11–15
11.4.3.2 Configuration #2 (Local EIA-232 to Remote EIA-485 [4-Wire])
Table 11-4. Local EIA-232 to Remote EIA-485 (4-Wire)
#2. Local End Modem Settings for EIA-232 (4-Wire)
Utility Interface Menu
ASYNC TX and RX Type EIA-232
Configuration Interface Menu
ASYNC TX and RX Baud Rate 150 to 38400 (See 11.4.1)
ASYNC TX and RX Length 7 bits
ASYNC TX and RX Parity Even
ASYNC TX Stop 2 bits
#2. Remote End Modem Settings for EIA-485 (4-Wire)
Utility Interface Menu
ASYNC TX and RX Type EIA-485 (4-wire)
Configuration Interface Menu
ASYNC TX and RX Baud Rate 150 to 38400 (See 11.4.1)
ASYNC TX and RX Length 7 bits
ASYNC TX and RX Parity Even
ASYNC TX Stop 2 bits
Utility System Menu
Remote Baud Rate Equal to ASYNC TX and RX baud rate
Parity Even
Address 1
to 255
The local end cable connects the 25-pin female ASYNC connector (on either the
breakout panel or the Y cable) to the EIA-232 (4-wire) remote terminal (WYSE or laptop
computer). The pinout of the local cable is listed in the following table.
#2. Local End EIA-232
9-Pin
Female Connector
25-Pin
Male Connector
RX 2 3 TX
TX 3 2 RX
GND 5 7 GND
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.
#2. 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-