Specifications

Appendix A: Communication Function Explanation
Appendix A -1
1. Introduction
This chapter explains the details and the methods of DVP
series PLC communication function. When DVP series PLC
communication port is used for the communication protocol of
slave, it can read and write the interior device of PLC to be the
operation reference used for connecting the master and HMI (or
other upper bit equipments) of PLC.
2. Communication Interface
PLC Models Communication Interface
Version 4.7
(included) or
less
COM1: RS-232C
COM2: RS-485
Either of them, they cannot be
the slave station at the same
time.DVP-ES/EX/SS
Version 5.1
(included) or
more
COM1: RS-232C
COM2: RS-485
They can be the slave station
at the same time.
3. Communication Protocol
Communication Protocol and Exterior Communication of
MOSBUS ASCII mode
Communication
format
Specifications
Baud rate 9600 bps
Start bit 1
Data length 7
Parity Even parity
Stop bit 1
4. Communication Connection Method
Communication
port
Communication connection method
RS-232
Use connection cables DVPACAB215,
DVPACAB230 or DVPACAB2A30
RS-485
Master must be with RS-485 interface
and use shielded twisted-pair cables.
5. Communication Message Format
STX Start bit ‘ : ’ (3AH)
ADR 1 Communication address:
ADR 0 Tw0 ASCII word bit, total 16 bit
CMD 1 Command code:
CMD 0 Tw0 ASCII word bit, total 16 bit
DATA ΰ0α Data content:
DATA ΰ1α “ n” numbers of ASCII word bit, total n*16
bit
………. Limit nЉ74 ASCII code
DATA ΰn-1α
LRC CHK 1 Detection error value:
LRC CHK 0 Tw0 ASCII word bit, total 16 bit
END 1 End word device:
END 0 END 1 = CRΰ0DHαΔEND 0 = LFΰ0AHα