4 SETTINGS AND PROCEDURES PRIOR TO OPERATION

MELSEC-Q

(b)Communication rate setting (CH1 side: switch 1 (upper level); CH2 side: switch 3 (upper level)) 1 2 3

Communication rate

Bit position

Communication rate

Bit position

Remarks

(Unit: bps)

b15 to b8

(Unit: bps)

b15 to b8

 

50

0FH

14400

06H

 

300

00H

19200

07H

Try lowering the communication

600

01H

28800

08H

rate when data cannot be

1200

02H

38400

09H

communicated normally with an

2400

03H

57600

0AH

external device due to overrun

4800

04H

115200

0BH

errors and framing errors etc.

9600

05H

230400

0CH

 

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 "00H" to the interface for which "GX Developer connection" is set in 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)

Set number

Description

Remarks

0H

GX Developer connection

GX Developer communication rate and transmission specifications are

automatically set.

 

 

 

1H

 

Format 1

 

2H

 

Format 2

For communication with ASCII code in the specified form of an A compatible 1C

3H

MC protocol

Format 3

frame or QnA compatible 2C/3C/4C frame

4H

 

Format 4

 

5H

 

Format 5

For communication with binary code in a QnA compatible 4C frame

6H

Non procedure protocol

For communication using non procedure protocol

7H

Bidirectional protocol

For communication using bidirectional protocol

8H

For linked operation setting

Set to the CH1 side when CH1 and CH2 interfaces are used in linked operation

(operated with the communication protocol of the CH2 side).

 

 

 

9H to DH

Setting prohibited

—

EH

ROM/RAM/switch test

For self-diagnosis of the modules

FH

Individual station loopback test

For checking operation of each interface of the modules

4 - 16

4 - 16