Mitsubishi MELSEC Q Series Handbook page 21

2
SERIAL COMMUNICATION MODULE REPLACEMENT
(2) Comparison between AnS series and Q series
(a) A1SJ71UC24-R2
Item
RS-232
Interface
RS-422/485
Communication
using dedicated
protocol
Communication
method
Non-procedural/
bidirectional
communication
Synchronization method
Transmission speed
Start bit
Data bit
Data format
Parity bit
Stop bit
Communication
using dedicated
protocol
Access cycle
Non-procedural/
bidirectional
communication
Parity check
Error
detection
Sum check
Transmission control
RS-232
Line
configuration
RS-422/485
(connection)
Communication
using dedicated
Line
protocol
configuration
Non-procedural
(data
communication
communication)
Bidirectional
communication
RS-232
Transmission
distance
RS-422/485
2
No. of E PROM writes
No. of flash ROM writes
No. of occupied I/O points
*1 On the Q series, this is called "MELSEC communication protocol" (abbrev. "MC protocol").
AnS series
A1SJ71UC24-R2
RS-232 compliant (D-Sub 9P)
-
Half-duplex communication
*1
Full duplex communication (1:1
connection)
Start stop synchronization (asynchronous method)
300 to 19200 bps
1 (vertical parity)/none
One request is processed when the mounted station programmable
controller CPU executes END processing.
Transmission can be executed at each send request,
and reception is available at all times.
Performed (odd/even)/none
Performed (MC protocol/Bidirectional)/none
DTR/DSR (ER/DR) control
CD signal control
DC1/DC3 (Xon/Xoff) control
DC2/DC4 control
-
(n:max.32, m+n:max.32)
1:1, 1:n (n:max.32)
-
Max. 100,000 times on same
2
area in E PROM
32 points/slot
(I/O assignment: special 32
points)
:Compatible,
Specifications
Q series
QJ71C24N
QJ71C24N-R2
RS-422/485 compliant
(2-piece terminal block)
Full duplex communication (1:1
connection)/
Half-duplex communication (1:n,
m:n connection)
50 to 230400 bps
1
7 or 8
1 or 2
RS-232 RS-422/485
Available N/A
Available N/A
Available Available
1:1
1 :1, 1 : n, m : n
(n:max. 32, m+n:max.32)
1:1, 1:n, m:n
1:1, 1:n, n:1 (n:max.32)
1:1
Max.15m
Max.1200m
(overall distance)
Max. 100,000 times on same
area in flash ROM
32 points/slot
(I/O assignment: intelli. 32
points)
:Partial change required, ×:Incompatible
Compat-
Precautions for replacement
ibility
QJ71C24N :1ch
QJ71C24N-R2 :2ch
QJ71C24N :1ch
-
QJ71C24N-R2 :none
For details on linked operation
between interfaces, refer to
the manual.
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