Parameter Description
Data bits
Data bits for serial communication:
- 5
- 6
- 7
- 8 (default)
Stop bits
You can select the number of stop bits for serial communication:
- 1 (default)
- 2
Parity
Parity for serial communication:
- Odd
- None
- Even
Termination
Onboard termination:
- On (default)
- Off
The following parameters are optional and can be adjusted for collecting data from slow Modbus
devices:
Parameter Description
byteTimeout
You can set the timeout interval between two consecutive bytes of the
same message received from the Modbus device. If the delay between is
longer than the given timeout, an error will be generated. Range: 500ms
(default) … 2000ms
responseTimeout
You can set the timeout interval used to wait for a response from the
Modbus device. If the waiting before receiving the response is longer than
the given timeout, an error will be generated. Range: 500ms (default) …
60000ms
responseSuspensionTime
If a byte timout or a response timeout was detected, then this waiting time
is added before the next request is started. During this time any response
from the Modbus device will be flushed Range: 0ms … 45000ms. (default:
1000ms). For Modbus RTU it is recommended to set the value to 10000
ms. If the default value 0 ms is set, any incoming incorrect responses will
not be destroyed.
requestDelay
You can set the time between the response from the Modbus device and
the next request to this Modbus device. Range: 0ms (default) … 10000ms
Pin assignment of Modbus protocols
The following table shows the pin assignment for the Modbus RTU protocol:
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