Db9 Loopback Plugs; Connecting Db9 Serial Devices - Comtrol DeviceMaster EIP Series Hardware Installation And Configuration Manual

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 to test serial ports. The DeviceMaster is shipped with a a single loopback plug (RS-
232/422).
Not all DeviceMaster protocols provide test (example programs). Refer to the
information about using those example programs.
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: 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.
3. You can refer to Network and Device LEDs
38 - Connecting Serial Devices
Pin 1
Pin 6
Pin 1
Pin 6
on Page 83 for information about the remaining LEDs.
DeviceMaster EIP | UP Hardware Installation and Configuration Guide: 2000633 Rev. C
EtherNet/IP User Guide
Pin 5
The RS-232 loopback plug
RS-232 Only
also works for RS-422.
(Back View)
Pin 9
Pin 5
RS-422 Only
(Back View)
Pin 9
for