C
We have some dedicated product gateways in our range. They mainly sserve as interface between KNX bus and the device (eg a ventilation unit).
We've been asked to investigate to add MODBUS as additional communication protocol.
I've done some research and have a basic technical understanding about MODBUS (coils, registers, RTU, TCP etc). But I don't have any idea on the application side.
So, I'd like to know what functionality a normal user/engineer would expect from such gateway in order to use it in a real MODBUS environment where he wants to integrate this device (eg ventilation unit).
1) would he expect the gateway/device to act as master or slave?
2) how would he like to configure the commands and status functions the gateway wants to expose? Is there a certain 'consensus' how this is typically done?
2.a) select coil/register or datatype (1 bit 16 bit N*16 bit)?
2.b) use specific types for status and command? E.g. coil for command and discrete output for status? Or the other way around? (same for input and holding register)
3) does anybody know of an existing documented MODBUS device gateway we could use as a best practice example?
Any indication is welcome
Christof
email: [email protected]
We've been asked to investigate to add MODBUS as additional communication protocol.
I've done some research and have a basic technical understanding about MODBUS (coils, registers, RTU, TCP etc). But I don't have any idea on the application side.
So, I'd like to know what functionality a normal user/engineer would expect from such gateway in order to use it in a real MODBUS environment where he wants to integrate this device (eg ventilation unit).
1) would he expect the gateway/device to act as master or slave?
2) how would he like to configure the commands and status functions the gateway wants to expose? Is there a certain 'consensus' how this is typically done?
2.a) select coil/register or datatype (1 bit 16 bit N*16 bit)?
2.b) use specific types for status and command? E.g. coil for command and discrete output for status? Or the other way around? (same for input and holding register)
3) does anybody know of an existing documented MODBUS device gateway we could use as a best practice example?
Any indication is welcome
Christof
email: [email protected]