Serial Communications Instructions - Omron CS1G/H-CPUxxH Instructions Manual

Serial Communications Instructions

3-24 Serial Communications Instructions
3-24-1 Serial Communications
842
• Transferring Data with Execution of DLNK(226)
Cycle time
One communications
cycle time
This section describes instructions used for serial communications.
Instruction
PROTOCOL MACRO
TRANSMIT
RECEIVE
CHANGE SERIAL PORT SETUP
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
Refreshing data link
data within PLC
Data transfer processing
Mnemonic
PMCR
TXD
RXD
STUP
Section 3-24
Data link
Function code Page
260 844
236 853
235 858
237 863