CDK-111A-Lite Owner's Guide - Ross Video

either end of the communications line. Anytime the major number is incremented,the minor number is reset to zero.The minor number is incremented if a change to the protocol or the applicationswhich use the protocol is backward compatible and will not break the operation ofeither end of the communications line.FunctionQUERYProtocol / Version (0x21, PROTO_VER)Command Data FieldsMajorMinorREPLY 1 byte 1 byteMajor byte value03 The query format of PROTO_VER, the major field indicates themajor protocol version that the controller is using.In the reply format, the field indicates the major protocol version that the tributary isusing.Minor byte value00 In the query format of PROTO_VER, the minor field indicates theminor protocol version that the controller is using.In the reply format, the field indicates the minor protocol version that the tributary isusing.CDK-111A-Lite • Owner’s Guide v4B Appendix A. Serial Protocols • 4-37