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Function Descriptions Appendix C
•Example
For further information and precautions on related Auxiliary Area flags, refer to the section on RXD Serial Com-
munications Instruction in the CS/CJ-series Instruction Reference Manual.
RXD_SCU: Receive String via Serial Port on Serial Communications Unit
• Function
Receives a text string from a serial port on a Serial Communications Unit (SCU).
• Application
RXD_SCU (Storage_location, Number_of_characters, SCU_unit_number, Serial_port,
Internal_logic_port);
• Conditions
The serial communications mode of the serial port must be set to no-protocol communications.
Related Auxiliary
Area Flag
Address Description
Port 1 Reception
Completed Flag
A356.06 ON when reception has been completed in no-protocol mode.
Port 1 Reception
Overflow Flag
A356.07 ON when a data overflow occurred during reception in no-pro-
tocol mode.
Port 1 Reception
Counter
A357 Contains the number of characters received in no-protocol
mode.
Port 2 Reception
Completed Flag
A356.14 ON when reception has been completed in no-protocol mode.
Port 2 Reception
Overflow Flag
A356.15 ON when a data overflow occurred during reception in no-pro-
tocol mode.
Port 2 Reception
Counter
A358 Contains the number of characters received in no-protocol
mode.
Variables
BOOL P_DoRecvData (* Variable to control receive function *)
STRING Message (* Variable to store received message *)
BOOL P_EndRecvSCBPort1 (* Reception Completed Flag *) AT A356.06
Use serial port 1
(* Use serial port number 1 *)
(* Receive data when P_DoRecvData is ON and reception has been completed*)
IF (P_DoRecvData = TRUE) AND (P_EndRecvSCBPort1 = TRUE) THEN
(* Get 16 characters *)
RXD_SCB(Message, 16, 1);
P_DoRecvData := FALSE;
END_IF;
Barcode reader
CPU Unit
Serial
Commu-
nications
Board
(SCB)
Serial
port 1
Message → Value to read
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