Mitsubishi Programmable Controllers FX-232ADP Guia do Utilizador descarregar pdf (Página 4)

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For data transmission to be effective it is necessary to match the communication format between the product and the

RS232C device, such as baud rate and parity.

*1 The default value is STX (02H: changeable).

*2 The default value is ETX (03H: changeable).

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The communication format is set by special data register D8120.

Setting the communication format using D8120 is effective only at the time the RS instruction is driven, and therefore

if changed after driving, it is not actually accepted.

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An example of setting D8120 is shown below.

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The control line is set by b12.

b12=0 :No hardware hand shaking.Send and receive are controlled by software protocol.

b12=1 :Hardware hand shaking.Signal lines ER(DTR)and DR(DSR)are used to control send and receive of data.

H138F= 0001 0011 1000 1111(binary)

The settings for the above program are as right.

b12 1

b11 0

SD(TXD)

H/W.

Ordinary

mode

Pin No.

ER(DTR)

DR(DSR)

When sending

RD(RXD)

ER(DTR)

DR(DSR)

When receiving

Pin No.

Data

SD(TXD)

RD(RXD)

ER(DTR)

b12 1

b11 1

H/W.

Single line

mode

Pin No.

Data

Send

Receive

Data

Receive

Data

[MOV D8120]H138F

Bit Description 0 (OFF) 1 (ON)

b 8 Header None D8124 *1

b 9 Terminator None D8125 *2

b10 Not used - - - - - -

b11

Mode

(Control line)

Ordinary

mode

Single line

mode

b12 Control line None H/W

b13

b14

b15

Not used - - - - - -

Data length 8 bit

Parity Even

Stop 2 bit

Baud rate 9,600

Header Used

Terminator Used

Control line H/W

Mode Ordinary mode

Bit Description 0 (OFF) 1 (ON)

b 0 Data length 7bit 8bit

b 1

b 2

Parity

(00) : None

(01) : Odd

(11) : Even

b 3 Stop 1bit 2bit

b 4

b 5

b 6

b 7

Baud rate

(bps)

(0011) : 300

(0100) : 600

(0101) : 1,200

(0110) : 2,400

(0111) : 4,800

(1000) : 9,600

(1001) : 19,200

Communication format D8120 (bit mapping)

M8002

Setting input

1 2 3 4 5 6 7 8 9 10 11 12

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