Ask Your Question

Handshake Modbus/TCP

asked 2020-06-25 11:30:29 +0000

salwa1215 gravatar image

I want to know how is the handshake of Modbus/TCP plz. I have a pcap file in which after each reponse of Modbus/TCP) I have a retransmission. That's mean that the server waits for an ACK also ? I thought that Modbus is only request/response communication and the communication stop when the reponse is received ?

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2020-06-25 11:34:23 +0000

grahamb gravatar image

Modbus itself is request\response, but when running over TCP, the underlying TCP stacks must obey TCP rules, i.e. retransmit a segment if an ACK isn't received.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


Asked: 2020-06-25 11:30:29 +0000

Seen: 40 times

Last updated: Jun 25