5.2. Multi-host Modbus polling
In practice, users need multiple hosts to monitor multiple 485 devices, such as requiring two computers to
monitor the same RS485 device. The USR-TCP232-30x can solve this problem with multi-host Modbus polling.
This feature can be enabled in “Expand Function” tab. In this work mode, the polling timeout is larger than
polling interval.
Note: Once this feature is enabled, the Modbus master must be network device and the serial device must be
Modbus slave.
Figure 52. Settings of Modbus multi-host polling
Figure 53. Test result of Modbus multi-host polling
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