M
I am new to ModBus and am developing a product which will have a ModBus interface on it. In order to be considered ModBus compliant:
1) Is there a required subset of Function Codes which MUST be supported, or may I only support the codes I choose to support, and return an exception response for the others?
2) My hardware won't have much buffering capacity. Is it ok to support only a limit size capacity for function codes such as 20 & 21 (Read/Write File Record), instead of the maximum possible size?
I will appreciate any guidance anyone can offer, thanks.
Matt
1) Is there a required subset of Function Codes which MUST be supported, or may I only support the codes I choose to support, and return an exception response for the others?
2) My hardware won't have much buffering capacity. Is it ok to support only a limit size capacity for function codes such as 20 & 21 (Read/Write File Record), instead of the maximum possible size?
I will appreciate any guidance anyone can offer, thanks.
Matt