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R-43
A Standard System Protocol
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
R-3 Mitsubi
s
h
i Co
mputer
Link
Ma
ster
(A-c
o
m
pati
b
le
1C
Fra
m
e
, Model
1)
Re
f
R
-3-3
Command F
rame Cont
ents
The Mitsubishi Computer Link Master Protocol provides the following 19 communications sequences.
The following table shows the structure of the Mitsubishi Computer Link Master (A-compatible 1C
frame, model 1) Protocol.
• Sending User-specified Commands
R-3-3 Command Frame Contents
Item Contents
Control code ENQ (05 hex) for A-compatible 1C frames, model 1.
Station No. This number distinguishes the remote destination Computer Link Module.
Setting range: 00 to 1 F hex (0 to 31 decimal), or FF hex (255 decimal) using global function. Set in
2 digits hexadecimal.
PLC No. This number distinguishes the remote destination Sequencer CPU Module. Set in 2 digits hexadec-
imal.
Accessing Sequencer CPU Module (local station) that is directly connected to the host using serial
communications: All FF hex (255 decimal)
Accessing Sequencer CPU Module (local station) on the MELSECNET or Ethernet network that is
not directly connected to the host using serial communications:01 to 40 hex (1 to 64 decimal) or 00
hex (0 decimal).
Command code Specify the processing command to read/write device memory and execute remote RUN/STOP of
the Mitsubishi Sequencer CPU Module at the remote destination.
Transmission delay This is the delay until a response is returned from the remote destination Computer Link Module.
The Transmission delay is not supported by this protocol, and 0 hex (0 ms) is set in the command
frame automatically.
Device type Set the following device type characters in ASCII.
All characters except T/C: X, Y, M, L, S, B, F, M, D, W, R, D
T/C characters: TS (contact), TC (coil), CS (contact), CC (coil), TN (PV), CN (PV)
Device address Specify the addresses for specified device types in hexadecimal.
Device points Specify the number of bits for bit data and the number of words for word data in hexadecimal.
R-3-4 Mitsubishi Computer Link Master Protocol Sequences
R-3-5 Structure of the Protocol
Sequence
No. (HEX)
Communications
sequence name
Computer Link
command
Function
800
(0320) Send/receive user-
specified Com-
puter Link com-
mands with ASCII
conversion User-specified Converts the text data of a user-specified Computer Link command
into ASCII and sends to the Mitsubishi Computer Link Module with
the specified station number (and the PLC number that follows).
The response data is converted into hexadecimal and stored in the
CS/CJ-series CPU Unit starting from the specified word.
801
(0321) Send/receive user-
specified Com-
puter Link com-
mands without
conversion User-specified Sends the text data of a user-specified Computer Link command to
the Mitsubishi Computer Link Module with the specified station
number (and the PLC number that follows) without converting into
ASCII. The response data is stored in the CS/CJ-series CPU Unit
starting from the specified word without converting into hexadeci-
mal.