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RS-232 port specifications
The RS-232 on the HDS4x2 is the same format as a PC-modem, and uses the same type cable as a serial
modem would, which is a standard straight through cable. Do not use a cable that is marked as a "Null Mo-
dem" cable.
The HDS4x2 can also be used with any USB to RS-232 conversion cable, these are all typically straight
through cables.
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
2 - TX
3 - RX
4 - No Connect
5 - GND
The port settings used by the HDS4x2 are:
Baudrate: 9600
Data Bits: 8
Stop Bits: 1
Parity:
NONE
18
5 4 3 2 1
9 8 7 6
6 - No Connect
7 - No Connect
8 - No Connect
9 - No Connect
The RS-232 Port
HDS4x2 User Guide, Rev 1.1, 08-31-07
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