Mitsubishi MELSEC Q Series Handbook

2 SERIAL COMMUNICATION MODULE REPLACEMENT
2 - 14
(2) Comparison between QnA/QnAS series and Q series
:Compatible, :Partial change required, ×:Incompatible
*1 On the Q series, this is called "MELSEC communication protocol" (abbrev. "MC protocol").
Item
Description
Compat-
ibility
Precautions for replacement
Reference
section
QnA series QnAS series Q series
AJ71QC24N
AJ71QC24N-R2
AJ71QC24N-R4
A1SJ71QC24N1
A1SJ71QC24N1-R2
QJ71C24N
QJ71C24N-R2
QJ71C24N-R4
Communication
using dedicated
protocol
*1
Communications in
ASCII mode
Communications in dedicated protocol is performed using
ASCII data.
Communications in
binary mode
Communications in dedicated protocol is performed using
binary data.
Device memory
read/write
Programmable controller CPU data is read/written to and
from external devices.
Access to another
station
Data is read/written to another station's programmable
controller CPU on the network system.
The program on the PC side
sometimes must be changed
according to the network to
pass through.
On-demand
Data is transmitted to external devices from the
programmable controller CPU.
Non-procedural
protocol
communication
Data transmission/
reception
Programmable
controller←→
External device
Data is transmitted/received between the programmable
controller CPU and external devices.
Data transmission/
reception in user frames
Data is transmitted or received using the data (user frames)
registered to the serial communication module.
Data transmission/
reception by ASCII
binary conversion
Binary data is converted to ASCII data before it is
transmitted.
Received ASCII data is converted to binary data.
Bidirectional
protocol
communication
Data transmission/
reception
Programmable
controller←→
External device
Data is transmitted/received between the programmable
controller CPU and external devices.
Data transmission/
reception by ASCII
binary conversion
Binary data is converted to ASCII data before it is
transmitted.
Received ASCII data is converted to binary data.
Communication by dedicated link
instruction
(SEND/RECV, READ/WRITE, REQ)
Data is transmitted/received with another
station's programmable controller CPU
on a multidrop connection by link
instructions.
-×
Study the method for
communicating via
MELSECNET/H.
Section
2.6.2
Transmission
control
DTR/DSR control
Data transmission/reception with external devices is
controlled by RS-232 control signals.
RS/CS control
CD signal control
DC code control
DC codes (including Xon/Xoff) are sent/received to control
data transmission/reception with external devices.

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English