Chapter 7
Troubleshooting and Maintenance
7–16
Only available on the RS-485 Comm port version. Use the TXEN test to
verify the transmit enable line at the RS-485 communications port.
The TXEN test requires a loopback connector with an LED. You can
construct a simple loopback connector as shown below:
DB9 Female
1
Data Out -
2
Data Out +
3
Data In -
4
Data In +
5
Signal Ground
6
Transmit Enable
7
Not Used
8
Signal Ground
9
Shield
Pin Signal Name
RS-485 Comm Port Only
Connects pins 1
!
3
and pins 2
!
4
LED and 750
W
resistor
between pins 2-4 and 6
Loopback Connector
750
W
LED
To test the transmit enable line:
1. Use the [NEXT] or [PREV] keys to display TXEN/ & Alarm Test on the
test selection screen.
DTAM Plus Diagnostic
NEXT to Select Test
ENTER To Initiate
TXEN/ & Alarm
2. Press [
] to initiate the test.
The following screen appears.
Toggling TXEN Line
A stable Alarm LED
Press ENTER
The Alarm LED flashes at approximately 1 second intervals indicating
that the transmit enable line is functioning properly.
3. Pressing [
] terminates the TXEN/ & Alarm test.
The next test selection screen is displayed.
DTAM Plus Diagnostic
NEXT to Select Test
ENTER To Initiate
Reset DUT
4. To terminate the test function , press the [NEXT] or [PREV] keys to
display Reset DUT in the test selection area. Press [
] to reset the
DTAM Plus.
TXEN Test
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