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DATA-LINC GROUP
14
PN 161-09981-002C
rev 8/04
DDAA1000/SRM User Guide
Troubleshooting
I have the units setup on a bench for testing, but the Master’s status LED keeps flashing or is solid and I do
not have a carrier.
When shipped, the units are setup for a maximum transmit power of 1 watt. If there are only a couple feet of separation
between them, the supplied whip antenna may need to be removed. Note that this will not damage the unit.
The units are installed in the field, but I have a flashing or solid LED on the status and no carrier.
The Master’s status LED only comes on when a responce from a remote is not obtained after 3 tries, then the Master
moves on to the next Remote. A solid light indicates that the Master can not connect to any remotes. A blinking light
indicates that the Master has lost communication with at least one remote. Most likely problem is a radio line-of-sight
problem exists If external antennas are being used, verify that they are grounded and that line of sight exists. Also verify
that the input power is OK. A UPS is recommended in areas where clean power may not exist. If units are bench
tested, and ther is no communications, then you may have a mis-configured system. If the system has been working
and then fails, check for cable and antenna connections, and DC power levels.
The power LED on one or both of my units is out and I have no communication.
Try cycling power on either of the units, the resettable fuse may have tripped. If communications do not come up again,
verify that there is power to the device. The supplied wall transformer output is nominally around 18 VDC when the radio
is not transmitting, and drops to 12 VDC when the transmitter is on. If the supply is okay and cycling power does not
fix the problem, contact Data-Linc Group.
My analog output reads 4 mA all the time.
Verify that the connection of the transducer at the transmitter is okay. Put a milliamp meter in the loop, and verify that
the connected transducer is supplying more than 4 mA into the unit. Verify that the correct current polarity is used.
Note that Data-Linc Group unit does not supply loop power.
My analog output is 0 or below 4 mA.
Contact Data-Linc Group. The analog output has failed. This is a hardware problem.
The discrete output will not activate my relay.
The discrete output of the DDAA1000 or DD1000 does not supply power for a relay coil. Refer to the open collector
diagram for connections.
My relay switches on and off constantly.
Verify that the Master’s status LED does not light. The status LED refers to loss of RF communication data stream.
Make sure the relay coil does not require more than 100 mA. The discrete outputs can only sink 100 mA.
The relay never switches.
Verify that the switch on the input side is wired properly to the DDAA1000 or DD1000. Check the discrete output with a
multimeter. Set the meter for continuity and place the “+” lead on the “G” or common terminal and “-” on the correct
discrete output.