Mitsubishi Electric GT14, User Manual

Page: 1408 / 1546

61 - 34
61. MICROCOMPUTER CONNECTION (SERIAL)
61.5 Message Formats
61.5.4 Formats 3 to 6 (A compatible 1C frame)

Basic format of data communication
This is the same message format as when communication is performed using the dedicated protocol (A compatible
1C frame) of the A Series computer link module.
For details of the basic format of data communication, refer to the following manual:
MELSEC-Q/L MELSEC Communication Protocol Reference Manual
This section describes items whose settings differ from the dedicated protocol of the A Series computer link modules,
and the dedicated commands for a GOT microcomputer connection.
Example: Request message for the batch read in word units (QR) command in format 4 (A compatible 1C frame
(format 2))

Details of data items in message format
POINT POINT POINT
Data code during communication
Communication is performed in ASCII code.
(1) Block No, PLC No.
Ignored in a microcomputer connection of the GOT.
Specify "00".
"00" is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
(2) Station No.
Station No. is used to identify the GOT with which the host communicates. (Setting range: 0 to 31)
Data notated in decimal is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
The GOT processes only commands whose station No. matches the "Host Address (0 to 31)" set at
"Communication Detail Settings". (The message of command whose station No. does not match is ignored.)
For setting method of "Communication Detail Settings", refer to the following.
61.6.1 Setting communication interface (Communication settings)
(3) Command
Specifies the contents to access from the host to GOT.
The command is converted to a 2-digit ASCII code (Hex) and transmitted from the upper digit.
For details of the commands that can be used, refer to the following.
61.5.2 List of commands
Sum check is performed in this range.
05
H
ENQ
(H) (L)
B A
42
H
41
H
Sum
Check
(H) (L)
Command
R
52
H
Q
51
H
(H)
Address
D 1
44
H
31
H
– –
0
30
H
0
30
H
(H) (L)
Number
of points
0 2
30
H
32
H
(H) (L)
Block No.
0
30
H
0
30
H
(H) (L)
Station
No.
0
30
H
0
30
H
(H) (L)
PLC No.
0
30
H
0
30
H
30
H
Wait
0
–
0
30
H
(L)
0
30
H
0
30
H
– –
Character A section