LXE 1280 Reference Guide

198 

Control Character (CTRL) 

LDS Plus Reference Guide 

E-SW-LDSPLUSRG-G 

The CTRL character is bit encoded -- each bit of the ASCII code for the character has a particular 
function. Bit 0 is the least significant bit (LSB) and Bit 6 is the most significant bit (MSB) of the 
7-bit host to network device communication code.  

•  If CTRL bit 0 (B0) is a zero, the message will be received only if the addressed DOS 

terminal has an empty receive memory buffer (non-forced message).  

•  If CTRL bit 0 is a 1, the DOS terminal will clear its receive memory and accept the 

message (forced message). 

The action of each bit of the CTRL character is listed in the following table. 

0 

0 

Message is accepted only if the receive memory buffer is empty (cleared). 

0 

1 

Message replaces any existing message in the receive memory buffer. 

1 

0 

Do not enable barcode or aux input. 

1 

1 

Enable barcode or aux input. 

2 

0 

and Bit 1 = 1. Place DOS terminal in barcode mode.  

2 

1 

and Bit 1 = 1. Place DOS terminal in Aux. input mode. 

3 

0 

No special effects or action. 

3 

1 

and Bit 4 = 0. Change Auto transmit buffer length.  
Requires N/EF character. 

 

 

and Bit 4 = 1. Enter Expanded function mode.  
Requires N/EF character. 

4 

0 

No special effects or action. 

4 

1 

and Bit 3 = 0. Activate multiple beeps.  
Requires N/EF character. 

 

 

and Bit 3 = 1. Enter Expanded function mode.  
Requires N/EF character.