IDEC MicroSmart - Manual (Page 311)

17: U SER C OMMUNICATION I NSTRUCTIONS
« FC4A M ICRO S MART U SER ’ S M ANUAL » 17-33
Setting User Communication Mode in WindLDR Function Area Settings
Since this example uses the RS232C port 2, select User Protocol for Port 2 in the Function Area Settings using WindLDR .
See page 17-5.
Setting Communication Parameters
Set the communication parameters to match those of the printer. See page 17-5. For details of the communication parame-
ters of the printer, see the user’s manual for the printer. An example is shown below:
Note: The receive timeout value is used for the RXD instruction in the user communication mode. Since this example uses
only the TXD instruction, the receive timeout value has no effect.
Ladder Diagram
The second data stored in special data register D8014 is compared with 0 using the CMP= (compare equal to) instruction.
Each time the condition is met, the TXD2 instruction is executed to send the C2 and D30 data to the printer. A counting
circuit for counter C2 is omitted from this sample program.
Communication Parameters:
Baud rate 9600 bps
Data bits 8
Parity check None
Stop bits 1
S1 –
3
M8120
REP D1 –
D8105
S2 –
0
REP D1 –
M0
M8120 is the initialize pulse special internal relay.
3
→ D8105 to enable the DSR option for busy control.
M8125 is the in-operation output special internal relay.
CMP=(W) compares the D8014 second data with 0.
When the D8014 data equals 0 second, M0 is turned on.
Counter C2 current value is moved to D31.
D8012 hour data is moved to D20.
D8013 minute data is moved to D21.
TXD2 is executed to send 73-byte data through the RS232C
por t 2 to the printer.
D20 hour data is conver ted from BCD to ASCII, and 2 digits
are sent.
D21 minute data is conver ted from BCD to ASCII, and 2 dig-
its are sent.
D31 counter C2 data is conver ted from BCD to ASCII, and 4
digits are sent.
D30 data is conver ted from BCD to ASCII, and 4 digits are
sent.
END
SOTU
SP
20h
SP
20h
SP
20h
–
2Dh
–
2Dh
–
2Dh
SP
20h
P
50h
R
52h
I
49h
N
4Eh
T
54h
SP
20h
T
54h
E
45h
S
53h
T
54h
SP
20h
–
2Dh
–
2Dh
–
2Dh
CR
0Dh
LF
0Ah
CR
0Dh
LF
0Ah
SP
20h
SP
20h
SP
20h
D20 Conversion: BCD →ASCII Digits: 2 REP: 01
H
48h
SP
20h
D21 Conversion: BCD
→ASCII Digits: 2 REP: 01
M
4Dh
CR
0Dh
LF
0Ah
CR
0Dh
LF
0Ah
SP
20h
SP
20h
SP
20h
C
43h
N
4Eh
T
54h
2
32h
.
2Eh
.
2Eh
.
2Eh
D31 Conversion: BCD
→ASCII Digits: 4 REP: 01
CR
0Dh
LF
0Ah
SP
20h
SP
20h
SP
20h
D
44h
0
30h
3
33h
0
30h
.
2Eh
.
2Eh
.
2Eh
D30 Conversion: BCD →ASCII Digits: 4 REP: 01
CR
0Dh
LF
0Ah
CR
0Dh
LF
0Ah
S1
73 D2
D0 D1
M1
M0
M0
MOV(W)
TXD
2
CMP=(W) S1 –
D8014
M8125
S1 –
C2
REP D1 –
D31
MOV(W)
S1 –
D8012
REP D1 –
D20
MOV(W)
S1 –
D8013
REP D1 –
D21
MOV(W)