10.3 Troubleshooting of USB modem
Below you can nd information on how to troubleshoot simple errors yourself.
LED on the USB modem Cause of error Remedy
Power LED is not lit. The USB cable is not connected.
• Connect the USB cable.
Connecting USB modem (Page 57)
Hardware fault occurred.
• Replace the device.
Power LED ashes yellow
during parameter assign‐
ment of the temperature
transmitter.
No temperature transmitter connected.
1. Check the polarity on the temperature transmit‐
ter.
Connecting USB modem (Page 57)
2. Check whether the loop current is at least
3.5 mA.
Comm LED is not lit. USB modem is not detected by the PC.
1. Check the port settings in SIPROM T.
2. Check the driver installation and reinstall SI‐
PROM T if necessary.
Error LED illuminates red
during the temperature
transmitter parameter as‐
signment.
Short-circuit at the modem terminals for
the temperature transmitter.
• Check the wiring of the modem terminals.
Connecting USB modem (Page 57)
Error LED is lit red. Hardware fault occurred.
• If the Error LED remains continuously lit even af‐
ter repeatedly switching the power supply of the
modem o and on, the USB modem is defective.
Replace the USB module.
See also
Meaning of LEDs on the USB modem (Page 25)
Diagnostics and troubleshooting
10.3 Troubleshooting of USB modem
SITRANS TS100/TS200/TS300/TS500/TSinsert/TSthermowell
126 Operating Instructions, 08/2020, A5E47810090-AA
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