PUSR USR-DR13 Series - Abnormal Response

USR-DR13X User Manual
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Figure 44. Query command setting
Figure 45. Test result of Modbus polling function
5.4. Abnormal Response
If DR13X fails to receive a Modbus response data from the serial device within the set time limit or the
Modbus response data is incorrect, it will report an abnormal response to the network-end device.