User guide

DeviceMaster FreeWire Installation and User Guide: 2000412 Rev. D Connecting the Serial Device - 41
Connecting the Serial Device
Connect the DeviceMaster FreeWire to your serial device using a standard RS-232
DB9 serial cable. You can build your own null-modem or straight-through DB9
serial cables using the following subsections.
Serial Port Signals
The following table provide serial port pinouts for the DeviceMaster FreeWire.
DB9 Loopback Plugs
Loopback connectors are DB9 female serial port plugs, with pins wired together as
shown, that are used in conjunction with application software (Test Terminal) to
test serial ports. The DeviceMaster FreeWire is shipped with a a single loopback
plug (RS-232).
Note: You can use Test Terminal to test the serial ports. You can use the Support
page on the CD shipped with the DeviceMaster FreeWire.
Wire the following pins together to build additional plugs or
replace a missing RS-232 loopback plug:
• Pins 1 to 4 to 6
•Pins 2 to 3
• Pins 7 to 8 to 9
DB9 Connector Pinouts
Pin RS-232
1DCD
2RxD
3TxD
4DTR
5GND
6DSR
7RTS
8CTS
9
RI (Ring) or +5 VDC
power input (selectable
via 3-pin jumper)
Pin 1
Pin 6
DB9 Male
RS-232
RI
CTS
RTS
DSR
GND
DTR
TxD
RxD
CD
Pin 1
Pin 5
Pin 6
Pin 9