Mitsubishi QJ71C24N User Manual page 29

1 OVERVIEW
QJ71E71
Q25HCPU
MELSEC
RUN ERR.
POWER
MODE
INIT. COM.ERR
OPEN
RUN
SD RD
ERR.
10BASE-T
USER
BAT.
BOOT
10BASE
PULL
USB
RS-232
+12V
12G
MITSUBISHI
1 - 3
(2) Data communication using the non procedure protocol
(Details are explained in Chapter 6 and the User's Manual (Application).)
(a) Data can be transferred in any message formats that conform to the
specifications of external devices (measuring devices, PCs, etc.).
(b) Fixed or variable length messages can be received in accordance with the
external device specifications.
• How to receive the variable length data
The external device sends data by adding at the end of the message the
end-code data (CR+LF or any one-byte data) that is set for the Q series C24.
• How to receive the fixed length data
The external device sends the amount of data equivalent to the size of the
end data that is set for the Q series C24.
Q25HCPU QJ71E71
MELSEC
RUN
POWER
MODE
INIT.
OPEN
RUN
SD
ERR.
USER
BAT.
BOOT
10BASE
PULL
USB
RS-232
MITSUBISHI
(c) ASCII code data can be used for communication using the ASCII-BIN
conversion function.
QJ71E71 QJ71C24
Q25HCPU
MELSEC
RUN ERR.
POWER MODE
INIT. COM.ERR CH1. CH2.
RUN OPEN
SD RD
ERR.
CH1.
10BASE-T
USER
BAT.
BOOT
RS-232
10BASE CH.2
SDA
1
SG
PULL
2
USB SDB
(FG)
3
RDA
4
(FG)
5
RS-232
RDB
+12V
6
12G
MITSUBISHI RS-422
7
/485
(d) It is necessary to create a sequence program for communication control that
is appropriate to the external device.
(e) Communication can be performed using a user frame by registering the fixed
format portion of the head and tail sections of a message as a user frame.
• When sending data, the Q series C24 adds a user frame to any data
specified by the user.
• When receiving data, the Q series C24 transfers any data excluding the
user frame to the programmable controller CPU.
QJ71C24
CH1. CH2.
CH1.
RS-232
CH.2
SDA
1
SG
2
SDB
(FG)
3
RDA
4
(FG)
5
RDB
6
RS-422
7
/485
(f) It is possible to clear the current reception data without interrupting the
transmission processing by using the dedicated instruction "CSET."
QJ71C24
ERR.
COM.ERR CH1. CH2.
RD
CH1.
10BASE-T
RS-232
(When receiving variable length data)
CH.2
SDA
1
SG
2
SDB
(FG) 3
RDA
4
(FG)
5
+12 V RDB
6
12G RS-422
7
/485
Binary
data
When receiving data
Any data format
STX
Any data format
ETX
When sending data
End
Reception data
code
Q series C24
ASCII-BIN
conversion
Binary
data
ETX
STX
MELSEC-Q
ASCII
data
1 - 3