The Enabler Card includes a special diagnostic feature called a loopback test. The loopback test provides a way to ensure the Enabler ports are able to transmit and receive data correctly. There are two tests, one for the RS-232 ports and one for RS-485.
To perform these tests, you need to make special cables connecting various transmit and receive pins on The Enabler Card's DB25 connector.
Important Note: If the Enabler card to be tested is in a PC with Enabler software installed, then you need to do the following before the test:- Stop the Pump Server
Don't restart the pump server until the tests are completed. - Reset the Enabler card
This is done by connecting pins 1 and 2 on the test header.
RS-232 Loop Back
This test verifies that the four RS-232 ports on the PCI card are operating correctly.
To make an RS-232 Loop back connector the following pin assignments are required on a Female DB25 Connector.
- Connect pin 2 to pin 6
- Connect pin 3 to pin 20
- Connect pin 5 to pin 8
- Connect pin 11 to pin 22
To perform an RS-232 loop back test, plug the RS-232 test connector into the Enabler PCI card (in a PC). Then connect pins 7 and 8 on the Enabler PCI test connector using a jumper. While the jumper is in place the test will be repeated every second.
- For each cycle of the test, both red and green LED's for all four ports will flash (it is a very fast sequence).
- If the test passes, the Red Heartbeat LED (closest to the DB25) will toggle (on to off, or off to on)
- If the test fails the Red Heartbeat LED will not flash.
- Test sequence will repeat.
RS-485 Loop Back
This test verifies that the three RS-485 ports (Port 1, 2 and 3) on the PCI card are operating correctly. The LEDs for port 4 will not flash as part of this test, because port 4 is RS-232 only.
To make an RS-485 Loop back connector the following pin assignments are required on a Female DB25 Connector.
- Connect pin 14 to 16 and then to 18
- Connect pin 15 to 17 and then to 19
To perform an RS-485 loop back test, plug the RS-485 test connector into an Installed Enabler PCI card (in a PC). Then connect pins 5 and 6 on the Enabler PCI test connector using a jumper. While the jumper is in place the test will be repeated every second.
- If the test fails the Red Heartbeat LED (closest to the DB25) will not flash.
- If the test is successful the LED's will flash in the following sequence:
- Port 1 Red, Port 2 Green and Port 3 Green
- Port 1 Green, Port 2 Red and Port 3 Green
- Port 1 Green, Port 2 Green, and Port 3 Red
- If the test passes, the Red Heartbeat LED (closest to the DB25) will toggle (on to off, or off to on)
- If the test fails the Red Heartbeat LED will not flash.
- Test sequence will repeat.