347
Serial Communications
Section 6-3
For example, simple (non-protocol) communications can be used to input data
from a barcode reader or output data to a printer.
The following table lists the no-protocol communication functions supported
by CP1L PLCs.
CP1L CPU Unit
TXD(236) or RXD(235)
Sending/receiving data
RS-232C or RS422A/485
Standard device with
serial communications
(e.g., barcode reader)
Transfer direction
Method
Max.
amount
of data
Frame format
Other functions
Start code
End code
Data transmission
(PLC
→
External device)
Execution of
TXD(236) in
the program
256 bytes
Yes: 00 to FF
No: None
Yes:
00 to FF or CR+LF
No: None
(The amount of data to
receive is specified
between 1 and 256 bytes
when no end code is speci-
fied.)
• Send delay time
(delay between
TXD(236) execu-
tion and sending
data from specified
port): 0 to 99,990
ms (unit: 10 ms)
• Controlling RS and
ER signals
Data reception
(External device
→
PLC)
Execution of
RXD(235) in
the program
256 bytes
Monitoring CS and
DR signals
Содержание CP1L-L14D Series
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Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Страница 523: ...490 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...498 Replacing User serviceable Parts Section 10 2...
Страница 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...636 Index...
Страница 671: ...638 Revision History...