Mitsubishi QJ71C24N User Manual page 30

Melsec-q series
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1 OVERVIEW
QJ71E71
QJ71C24
MELSEC
Q25HCPU
RUN
ERR.
POWER
MODE
INIT.
COM.ERR
CH1.
OPEN
RUN
SD
RD
ERR.
10BASE-T
USER
BAT.
BOOT
RS-232
10BASE
CH.2
PULL
USB
(FG)
(FG)
RS-232
+12V
12G
MITSUBISHI
RS-422
/485
1 - 4
(3) Data communication using the bidirectional protocol
(Details are explained in Chapter 7 and the User's Manual (Application).)
(a) In communication between programmable controller CPUs and
communication with an external device for which transmission/receive
control programming is allowed, data communication is performed in a
sequence of "data transmission and response receipt".
(b) Error check of received data can be performed using the sum-check code,
while the occurrence of a reception error at an external device can be
checked via an ACK/NAK response.
CH2.
CH1.
ENQ
SDA
1
SG
2
SDB
3
RDA
4
5
RDB
6
7
(c) ASCII code data can be used for communication using the ASCII-BIN
conversion function.
QCPU
Q25HCPU
MODE
RUN
ERR.
USER
BAT.
BOOT
Binary
data
USB
RS-232
Data length
Any data
Sending completed normally
Error
code
Sending completed
abnormally
ASCII
Q series C24
data
ASCII-BIN
conversion
Binary
data
MELSEC-Q
Sum check
code
ACK
NAK
1 - 4

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