90 - Connecting Serial Devices
DeviceMaster Installation and Configuration Guide
: 2000594 Rev. F
Connecting Serial Devices
DB9 Loopback Plugs
Loopback connectors
are DB9 female serial port plugs with pins wired together that are used in conjunction
with application software (Test Terminal or minicom) to test serial ports. The DeviceMaster is shipped with a
a single loopback plug (RS-232/422).
Note:
You can use Test Terminal (Windows) or minicom (Linux) to test the serial port. You can refer to
on Page 154 for Windows systems.
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
Wire the following pins together for an RS-422 loopback plug:
•
Pins 2 to 3
•
Pins 7 to 8
Connecting DB9 Serial Devices
You can use this information to connect serial devices to DB9 connectors.
1.
Connect your serial devices to the appropriate serial port on the DeviceMaster using the appropriate
cable.
Note:
Refer to the hardware manufacturer’s installation documentation if you need help with connector
pin outs or cabling for the peripheral device.
2.
DeviceMaster 4-port, 8-port models, and the DeviceMaster Serial Hub 16-port: verify that the devices are
communicating properly.
Note:
DeviceMaster 1-port, 2-port models, and the 4-port DIN models do not
have TX/RX LEDs.
The RX (yellow) and TX (green) LEDs function accordingly when the cable is
attached properly to a serial device.
•
After power cycling the DeviceMaster (appropriate models), the RX/TX LEDs are off.
•
The LEDs do not function as described until the port has been opened by an application. You can use
Test Terminal to open a port or ports if you want to test a port or ports (
3.
You can refer to
on Page 167 for information about the remaining LEDs.
Mode
Serial Number Below xxxx-030000
Serial Number Above xxxx-030000
RS-232
RS-422
RX LEDs (yellow) are lit when connected to a
valid RS-232 device
TX LEDs (green) are lit during active data
transmission
RX LEDs (yellow) are lit while receiving data
TX LEDs (green) are lit during active data
transmission
RS-485
RX LEDs (yellow) are lit while receiving data
TX LEDs (green) are lit during active data
transmission
Where xxxx is the first four digits of the product serial number.
Pin 1
Pin 5
Pin 6
Pin 9
RS-232 Only
(Back View)
The RS-232 loopback plug
also works for RS-422.
Pin 1
Pin 5
Pin 6
Pin 9
RS-422 Only
(Back View)
