10: U
SER
C
OMMUNICATION
I
NSTRUCTIONS
10-38
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
Sample Program – User Communication TXD
This example demonstrates a program to send data to a printer using the user communication TXD2 (transmit) instruc-
tion, with the optional RS232C communication adapter installed on the port 2 connector of the 24-I/O type CPU module.
System Setup
To RS232C Port
D-sub 9-pin Connector Pinouts
Pin
Description
1
NC
No Connection
2
NC
No Connection
3
DATA
Receive Data
4
NC
No Connection
5
GND
Ground
6
NC
No Connection
7
NC
No Connection
8
BUSY
Busy Signal
9
NC
No Connection
Printer
Mini DIN Connector Pinouts
Description
Color
Pin
Shield
—
Cover
NC
No Connection
Black
1
NC
No Connection
Yellow
2
TXD
Transmit Data
Blue
3
NC
No Connection
Green
4
DSR
Data Set Ready
Brown
5
NC
No Connection
Gray
6
SG
Signal Ground
Red
7
NC
No Connection
White
8
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 pin-
outs shown below.
Cable Connection and Pinouts
To Port 2 (RS232C)
RS232C Communication Adapter
FC4A-PC1
The name of BUSY terminal differs depending on printers, such as DTR. The function of this terminal is to send a signal to
remote equipment whether the printer is ready to print data or not. Since the operation of this signal may differ depend-
ing on printers, confirm the operation before connecting the cable.
Caution
Do not connect any wiring to the NC (no connection) pins; otherwise, the MicroSmart and the
printer may not work correctly and may be damaged.
Description of Operation
--- PRINT TEST ---
11H 00M
CNT2...0050
D030...3854
--- PRINT TEST ---
11H 01M
CNT2...0110
D030...2124
Printout Example
The data of counter C2 and data register D30 are printed every minute. A printout
example is shown on the right.
Programming Special Data Register
Special data register D8105 is used to monitor the BUSY signal and to control the
transmission of print data.
Special DR
Value
Description
D8105
3
(011)
While DSR is on (not busy), the CPU sends data.
While DSR is off (busy), the CPU stops data transmission.
If the off duration exceeds a limit (approx. 5 sec), a transmis-
sion busy timeout error will occur, and the remaining data is
not sent. The transmit status data register stores an error code.
See pages 10-11 and 10-32.
The MicroSmart monitors the DSR signal to prevent the receive buffer of the printer from overflowing. For the DSR signal,
see page 10-36.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]