842
Serial Communications Instructions
Section 3-24
• Transferring Data with Execution of DLNK(226)
3-24 Serial Communications Instructions
This section describes instructions used for serial communications.
3-24-1 Serial Communications
There are two types of serial communications instruction. TXD(236) and
RXD(235) send and receive data in no-protocol (custom) communications
with an external device. PMCR(260) sends and receives data using user-
defined protocols with an external device. The difference is shown in the fol-
lowing tables.
Note The PMCR(260) protocol macro function includes the no-protocol communi-
cations function of TXD(236) and RXD(235). TXD(236) and RXD(235) are
used only for the serial port in the CPU Unit. PMCR(260) is used only for the
Cycle time
Refreshing data link
data within PLC
Data transfer processing
Data link
One communications
cycle time
Instruction
Mnemonic
Function code
Page
PROTOCOL MACRO
PMCR
260
TRANSMIT TXD
236
RECEIVE RXD
235
CHANGE SERIAL PORT SETUP
STUP
237
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
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