Mitsubishi QJ71C24N User Manual page 121

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
Communication rate
(Unit: bps)
50
300
600
1200
2400
4800
9600
Set number
GX Developer connection
0
H
(For connection to MELSOFT products)
1
H
2
H
MC protocol
3
H
4
H
5
H
6 Non procedure protocol
H
7 Bidirectional protocol
H
8 For linked operation setting
H
9 Pre-defined protocol
H
A to D Setting prohibited
H H
E ROM/RAM/switch test
H
F Individual station loopback test
H
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(b) Communication rate setting (CH1 side: switch 1 (upper level); CH2 side:
switch 3 (upper level))
Bit position Communication rate
(Unit: bps)
b15 to b8
0F
H
00
H
01
H
02
H
03
H
04
H
05
H
1 Transmission speed of 230,400 bps is available for only CH1 of the
QJ71C24N (-R2/R4).
2 When connecting external devices to both of two interfaces, the total of
the communication speed should be 115,200bps or less (230,400 bps
or less if using QJ71C24N (-R2/R4)). When connecting an external
device to either of two interfaces, the maximum of 115,200 bps is
available for the interface (the maximum of 230,400 bps if using
QJ71C24N (-R2/R4)). In this case, set 300 bps for the other interface to
which no external device is connected.
3 Set "00 " to the interface for which "GX Developer connection" is set in
H
the communication protocol setting. Serial communication module will
operate at the communication speed set on the GX Developer.
(c) Communication protocol setting (CH1 side: switch 2; CH2 side: switch 4)
Description
GX Developer communication rate and transmission specifications are
automatically set.
Format 1
Format 2 For communication with ASCII code in the specified form of an A compatible 1C
frame or QnA compatible 2C/3C/4C frame
Format 3
Format 4
Format 5 For communication with binary code in a QnA compatible 4C frame
For communication using non procedure protocol
For communication using bidirectional protocol
Set to the CH1 side when CH1 and CH2 interfaces are used in linked operation
(operated with the communication protocol of the CH2 side).
For communication using pre-defined protocol
For self-diagnosis of the modules
For checking operation of each interface of the modules
1 2 3
Bit position
b15 to b8
14400 06
19200 07
28800 08
38400 09
57600 0A
115200 0B
230400 0C
MELSEC-Q
Remarks
H
Try lowering the communication
H
rate when data cannot be
H
communicated normally with an
H
external device due to overrun
H
errors and framing errors etc.
H
H
Remarks
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