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#1 2016-09-30 16:54:38
- hendrik
- Member
- Registered: 2015-11-01
- Posts: 49
Modbus - ASCII protocol
I have a 3rd party controller which uses ASCII syntax commands over Ethernet (Modbus - TCP/UDP) My question is how do I send ASCII syntax commands from Rex target device to 3rd party controller and vice versa?
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#2 2016-10-02 14:31:04
- jaroslav_sobota
- Administrator
- Registered: 2015-10-27
- Posts: 535
Re: Modbus - ASCII protocol
Hi Hendrik,
the Modbus driver of the REX Control System does not support ASCII format, sorry.
You can still implement arbitrary communication protocol using the REXLANG programmable function block. Here is an example on UDP communication and here is one on TCP communication.
Hope this helps,
Jaroslav
Monarco HAT for Raspberry Pi - Lightweight I/O for monitoring, archiving and control.
Raspberry Pi in industrial automation!
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#3 2016-10-03 16:27:29
- hendrik
- Member
- Registered: 2015-11-01
- Posts: 49
Re: Modbus - ASCII protocol
Thanks, not sure if I need to add the Modbus drivers to the EXEC?
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#4 2016-10-03 16:49:33
- jaroslav_sobota
- Administrator
- Registered: 2015-10-27
- Posts: 535
Re: Modbus - ASCII protocol
Hi Hendrik,
no need to include Modbus driver in your case. You will implement your own inside the REXLANG block.
Jaroslav
Monarco HAT for Raspberry Pi - Lightweight I/O for monitoring, archiving and control.
Raspberry Pi in industrial automation!
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