Comtech EF Data SDM-300A, Installation And Operation Manual

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Options SDM-300A Satellite Modem
A–32 Rev. 4
A.1.4.5.3 Configuration #3 (Local EIA-232 to Remote EIA-485 [2-Wire])
Table A-7. Local EIA-232 to Remote EIA-485 (2-Wire)
#3. Local End Modem Settings for EIA-232
Utility Interface Menu
ASYNC TX and RX Type EIA-232
Configuration Interface Menu
ASYNC TX and RX Baud Rate 150 to 38400 (See A.1.4.3.10)
ASYNC TX and RX Length 7 bits
ASYNC TX and RX Parity Even
ASYNC TX Stop 2 bits
#3. Remote End Modem Settings for EIA-485 (2-Wire)
Utility Interface Menu
ASYNC TX and RX Type EIA-485 (2-wire)
Configuration Interface Menu
ASYNC TX and RX Baud Rate 150 to 38400 (See A.1.4.3.10)
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 remote terminal (WYSE or laptop
computer). The pinout of the local cable is listed in the following table.
#3. 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.
#3. Remote End EIA-485 (2-Wire)
9-Pin
Male Connector
25-Pin
Male Connector
TX/RX+ 4 14, 16 TX+, RX+
TX/RX- 5 2, 3 TX-, RX-