yes, when i send the payload to the serial port, following all parameters as given, the device doesn't reply as it should.
i had checked the communication with the port by passing in a handshake frame (main characters was in ascii) and the device reply.
this made me think that the data sent aren't in hex type.
the protocol is IEC 62056-21. the handshake frame is [0x2f, 0x3f, 0x21, 0x0D, 0x0A]
the aim of this feed to get your guidance on how to know if my device is replying after sending a frame of hex value.
okay got it, at the beginning i was adding them manually but i figure it out they give the same outcome as they were added in the node.
and following some software doing the same stuff that i want to do, they don't add 0D0A after the handshake