Comtech EF Data MM200 - Manual (Page 80)

Electrical Interfaces MM200 High-Speed Microwave Modem
5-4 TM086 - Rev. 4.1
5.4.1 Remote Port Cabling for a Standard Computer RS-232 COM Port
A cable with the following pin-outs is used for Remote Port Communications.
Remote Port Cabling for a Standard
Computer RS-232 COM Port - 9-Pin ‘D’ Male
Computer
End Pin No.
Signal Modem End
Pin No.
2 Tx (B) 6
3 Rx (B) 9
5 GND 5
If the MM200 does not have the option of changing from RS-232 to RS-422, an RS-232 to RS-422
Interface Converter is required. The RS-422 end is attached to the cable, the other is attached to
the standard COM Port of the computer. A suggested converter is P/N K422-99 available from
KK Systems, Ltd. (www.kksystems.com).
If communication is required to a Remote Port via an Overhead Interface, the following cabling is
required (refer to Figure 5-2):
Figure 5-2. Standard Computer Cabling Block Diagram
From the Computer Remote Cable
to the Overhead (Cable A)
9-Pin ‘D-Sub’ 15-Pin HD
Female ‘D-Sub’ Male
1 -TX 6 -TX
5 GND 2 GND