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*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
any change after driving is not actually accepted.
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An example of setting D8120 is shown below.
Setting input
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The control line is set by b10.
b10 = 0 :No hardware handshaking.Send and receive are controlled by software protocol.
b10 = 1 :Hardware handshaking.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.
b15
b0
H/W.
Ordinary
mode
When sending
RD(RXD)
ER(DTR)
DR(DSR)
When receiving
Pin No.
Data
Data
SD(TXD)
RD(RXD)
ER(DTR)
b 10 1
b 11 1
H/W.
Single line
mode
Pin No.
Data
Send
Send
Receive
Data
Receive
[MOV H138F
M8002
b 10 1
b 11 0
Pin No.
SD(TXD)
ER(DTR)
DR(DSR)
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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.
Communication format D8120 (bit mapping)
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
Parity
(00) : None
(01) : Odd
(11) : Even
b 3 Stop 1bit 2bit
Baud rate
(bps)
(0011) : 300
(0100) : 600
(0101) : 1,200
(0110) : 2,400
(0111) : 4,800
(1000) : 9,600
(1001) : 19,200
Bit Description 0(OFF) 1(ON)
b 8 Header None D8124 *1
b 9 Terminator None D8125 *2
b10 Control line None H/W
b11
Mode
(Control line)
Ordinary
mode
Single line
mode
b12
b13
b14
b15
Not used - - - - - -
D8120]
b 1
b 2
b 4
b 5
b 6
b 7