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Serial Communications Instructions Section 3-23
If ER signal control is specified in C, bit 15 of S will be used as the ER signal.
If RS and ER signal control is specified in C, bit 15 of S will be used as the RS
signal and bit 14 of S will be used as the ER signal.
If 1, 2, or 3 hex is specified for RS and ER signal control in C, TXD(236) will be
executed regardless of the status of the Send Ready Flag.
An error will occur and the Error Flag will turn ON in the following cases.
• No-protocol mode is not set for the port in the PLC Setup.
• The value of C is not within range.
• The value for N is not between 0000 and 0100 hex.
• A send was attempted when the Send Ready Flag was OFF.
Related PLC Setup Settings
The following PLC Setup settings must be made for the serial port 1 or serial
port 2 executing TXD(236) after setting the communications mode to no-pro-
tocol (RS-232C mode).
Auxiliary Area
Setting Description
Communications Settings Standard The standard settings are as follows:
9,600 baud, 1 start bit, 7-bit data, even
parity, and 2 stop bits.
Custom Baud: 300, 600, 1,200, 2,400, 4,800,
9,600, 19,200, 38,400, 57,600, or
115,200 bps
Format: 7- or 8-bit data; 1 or 2 stop
bits; even, odd, or even parity
Start Code Disable ---
Set 00 to FF hex
End Code Received
Bytes
No ---
Yes 00 hex: 256 bytes
01 to FF hex: 1 to 255 bytes
End Code No ---
CR/LF ---
Set 00 to FF hex
Delay 0000 to 210F hex: 0 to 99,990 ms (10-ms units)
Name Address Contents
Serial Port 1 Send Ready
Flag
A392.13 ON when data can be sent in no-proto-
col mode.
Serial Port 2 Send Ready
Flag
A392.05
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