IDEC MicroSmart - Manual (Page 313)

17: U SER C OMMUNICATION I NSTRUCTIONS
« FC4A M ICRO S MART U SER ’ S M ANUAL » 17-35
Configuring Barcode Reader
The values shown below are an example of configuring a barcode reader. For actual settings, see the user’s manual for the
barcode reader.
Allocation Numbers
Ladder Diagram
When the MicroSmart starts operation, the RXD1 instruction is executed to wait for incoming data. When data receive is
complete, the data is stored to data registers D20 and D21. The receive completion signal is used to execute the RXD1
instruction to wait for another incoming data.
RXD1 Data
Synchronization mode Auto
Read mode Single read or multiple read
Communication parameter
Baud rate: 9600 bps
Parity check: Even
Data bits: 7
Stop bit: 1
Other communication settings
Header: 02h
Data echo back: No
Output timing: Output priority 1
Data output filter: No
Sub serial:
No
Terminator: 03h
BCR data output: Yes
Character suppress: No
Main serial input:
No
Comparison preset mode Not used
M100 Input to star t receiving barcode data
M101 Receive completion output for barcode data
M8120 Initialize pulse special internal relay
D20 Store barcode data (upper 4 digits)
D21 Store barcode data (lower 4 digits)
D100 Receive status data register for barcode data
D101 Receive data byte count data register
M8120
M8120 is the initialize pulse special internal relay used to set M100.
At the rising edge of M100, RXD1 is executed to be ready for receiving
data.
Even after M100 is reset, RXD1 still waits for incoming data.
When data receive is complete, M101 is turned on, then M100 is set to
execute RXD1 to receive the next incoming data.
END
S1
10 D2
D100
D1
M101
M101
RXD
1
M100
M100
S
M100
R
M101
R
M100
S
STX
(02h)
ETX
(03h) Data Register
D20 B4 2
End Delimiter
D20, ASCII to BCD Conversion (4 digits), Repeat: 2
Star t Delimiter