194
Function Descriptions Appendix C
•Example
For further information and precautions on related Auxiliary Area flags, refer to the section on TXD Serial Com-
munications Instruction in the CS/CJ-series Instruction Reference Manual.
TXD_SCU: Send String via Serial Port on Serial Communications Unit
• Function
Sends a text string from a serial port on a Serial Communications Unit (SCU).
• Application
TXD_SCU (Send_string, 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 Send Ready
Flag
A356.05 ON when sending is enabled in no-protocol mode.
Port 2 Send Ready
Flag
A356.13 ON when sending is enabled in no-protocol mode.
Variables
BOOL P_DoSendData (* Variable to control send function *)
INT iProcess (* Process number *)
STRING Message (* Send message *)
BOOL
P_SendEnableSCBPort1
(* Send Ready Flag *) AT A356.05
Serial port 1 used.
(* Use serial port number 1 *)
(*Send data when P_DoSendData is ON and iProcess is 0 *)
IF (P_DoSendData = TRUE) AND (iProcess = 0) THEN
iProcess := 1;
P_DoSendData := FALSE;
END_IF;
(* Execute send processing according to process number *)
CASE iProcess OF
1: (* Create send text data *)
Message := '@READ';
iProcess := 2;
2: (* Execute send function if sending is enabled *)
IF
P_SendEnableSCBPort1
= TRUE THEN
TXD_SCB(Message, 1);
iProcess := 3;
END_IF;
3: (* Sending is finished if Send Ready Flag is ON *)
IF
P_SendEnableSCBPort1
= TRUE THEN
iProcess := 0;
END_IF;
END_CASE;
CPU Unit
Barcode Reader
Serial
Communi-
cations
Board
(SCB)
Get Scene Number
command: @READ
Serial
port 1
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