MAS7.1 Supplemental Guide, Rev 1.1, 9/28/07
3
RS-232 Port Hardware
RS-232 Pinout and Baudrate Settings
The RS-232 port on the MAS7.1 is the same format, and pinout, as a PC modem, and uses the same type of
cable as a standard serial modem would, which is a standard straight through cable. Do not use a cable that is
marked as a “Null Modem” cable.
The MAS7.1 can also be used with any USB to RS-232 conversion cable, these are all typically straight
through cables.
(Be sure to install any drivers that come with the USB to RS-232 cable you are using.)
The RS-232 port is a female type DE-9 connector (sometimes mistakenly referred to as a DB-9 connector) with
the following pinout:
Pin definitions:
1 - No Connect
6 - No Connect
2 - TX
7 - No Connect
3 - RX
8 - No Connect
4 - No Connect
9 - No Connect
5 - GND
The port settings used by the MAS7.1 are:
Baudrate:
9600
Data Bits:
8
Stop Bits:
1
Parity:
NONE