When the buffer of the Model 24SII DES can receive more data, the Model 24SII DES will send an XON to Computer A.
NOTE: For computers sending binary data and using XON/XOFF handshaking, the input flow control (Recv) should be enabled and the output flow control (Xmit) should be disabled. This will allow any XON or XOFF character sent in the binary string to be passed through the Model 24SII DES to the receiving device.
You may wish to write your own program for sending the port select sequence to the Model 24SII DES instead of manually inserting it or utilizing the hot keys provided in BayTech's supplied support software program.
A simple procedure when using word processing programs is to create an ASCII file for each printer which contains the Port Select Code, the device module number (1 to 6), the device port number, and the terminating character. This file could be named PRINTER1. When you wish to select a particular device, you simply print this file followed by the actual print file.
Another method is to make the port select sequence the first characters of the text. These characters will be trapped by the Model 24SII DES and will not be sent to the printer. This method will work only if the text of the print file is sent in an ASCII format.
You may also use a DOS batch file to send a port select sequence. The DOS command typically used is the ECHO command. An example of the ECHO command used to select a printer connected to Port 2 of Module 2 using the default Port Select Code is as follows:
ECHO $PRINTER22>LPT1:.