Siemens MindConnect Nano System Manual page 66

Configuring protocols
4.5 Overview of Modbus RTU protocol for MindConnect Nano
Parameter
Data bits
Stop bits
Parity
Termination
The following parameters are optional and can be adjusted for collecting data from slow Modbus
devices:
Parameter
byteTimeout
responseTimeout
responseSuspensionTime
requestDelay
Pin assignment of Modbus protocols
The following table shows the pin assignment for the Modbus RTU protocol:
MindConnect Nano
System Manual 7/2023
Description
Data bits for serial communication:
- 5
- 6
- 7
- 8 (default)
You can select the number of stop bits for serial communication:
- 1 (default)
- 2
Parity for serial communication:
- Odd
- None
- Even
Onboard termination:
- On (default)
- Off
Description
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
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
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.
You can set the time between the response from the Modbus device and
the next request to this Modbus device. Range: 0ms (default) ... 10000ms
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