IDEC MicroSmart - Manual (Page 312)

17: U SER C OMMUNICATION I NSTRUCTIONS
17-34 « FC4A M ICRO S MART U SER ’ S M ANUAL »
Sample Program – User Communication RXD
This example demonstrates a program to receive data from a barcode reader with a RS232C port using the user communi-
cation RXD1 (receive) instruction.
System Setup
Description of Operation
A barcode reader is used to scan barcodes of 8 numerical digits. The scanned data is sent to the MicroSmart through the
RS232C port 1 and stored to data registers. The upper 8 digits of the data are stored to data register D20 and the lower 8
digits are stored to data register D21.
Setting User Communication Mode in WindLDR Function Area Settings
Since this example uses the RS232C port 1, select User Protocol for Port 1 in the Function Area Settings using WindLDR .
See page 17-5.
Setting Communication Parameters
Set the communication parameters to match those of the barcode reader. See page 17-5. For details of the communication
parameters of the barcode reader, see the user’s manual for the barcode reader. An example is shown below:
Communication Parameters:
Baud rate 9600 bps
Data bits 7
Parity check Even
Stop bits 1
To RS232C Por t
D-sub 25-pin Connector Pinouts
Pin Description
1 FG Frame Ground
2 TXD1 Transmit Data
3 RXD1 Receive Data
7 GND Ground
Barcode Reader
Mini DIN Connector Pinouts
Description Color Pin
Shield — Cover
NC No Connection Black 1
NC No Connection Yellow 2
TXD Transmit Data Blue 3
RXD Receive Data Green 4
NC No Connection Brown 5
NC No Connection Gray 6
SG Signal Ground Red 7
NC No Connection White 8
To RS232C Por t 1
User Communication Cable 1C
FC2A-KP1C
2.4m (7.87 ft.) long
Attach a proper connector to the open
end of the cable referring to the cable
connector pinouts shown below.
Caution
• Do not connect any wiring to the NC (no connection) pins; otherwise, the
MicroSmart and the
barcode reader may not work correctly and may be damaged.