LXE 1280 Reference Guide

RS-232 Port and ASCII Control Characters 

207 

E-SW-LDSPLUSRG-G 

LDS Plus Reference Guide 

ASCII control characters (ASCII 00 Hex through 1F Hex) must be disguised before being 
presented to the Network Controller. 

When the text contains a tilde character (~ ASCII 7E Hex), this character is converted at 
the DOS terminal into a C

R

 (ASCII 0D Hex) followed by a L

F

 (ASCII 0A Hex) before 

being sent to the RS-232 port. This permits multiple line output to a printer or other 
device with a single RF transmission. The character appears as the tilde (~) on the DOS 
terminal display. 

When the text contains the Delete code (ASCII 7F Hex), the delete character is not sent 
to the RS-232 port, and the character following the DEL code is converted into the 
corresponding ASCII control code in much the same way as holding down the CTRL key 
of a DOS terminal. 

The following chart lists the ASCII Hex for each of the ASCII Control characters along with the 
character pair which the host must present to the network price for passage to the DOS terminal 
RS-232 port. 

NUL 

00 

DEL and @ 

7F, 40 

SOH 

01 

DEL and A 

7F, 41 

STX 

02 

DEL and B 

7F, 42 

ETX 

03 

DEL and C 

7F, 43 

EOT 

04 

DEL and D 

7F, 44 

ENQ 

05 

DEL and E 

7F, 45 

ACK 

06 

DEL and F 

7F, 46 

BEL 

07 

DEL and G 

7F, 47 

BS 

08 

DEL and H 

7F, 48 

HT 

09 

DEL and I 

7F, 49 

LF 

0A 

DEL and J 

7F, 4A 

VT 

0B 

DEL and K 

7F, 4B 

FF 

0C 

DEL and L 

7F, 4C 

CR 

0D 

DEL and M 

7F, 4D 

SO 

0E 

DEL and N 

7F, 4E 

SI 

0F 

DEL and O 

7F, 4F 

DLE 

10 

DEL and P 

7F, 50 

DC1 

11 

DEL and Q 

7F, 51