Remote 
Programming 
INPUT 
SYNTAX 
DEVICE-DEPENDENT MESSAGES 
Single-character Commands 
? 
* 
Two-character Commands 
Bn Cn On  Fn Gn 
Pn 
Rn Sn Wn  Xn  Yn Zn 
Numeric-entry Characters 
NE.+-0123456789 
Terminators 
CR 
LF 
GET 
EOI 
INTERFACE MESSAGES 
Address Messages 
MLA 
MTA 
UNL 
UNT 
Universal Commands 
ATN 
DCL 
I 
FC 
LLO 
REN 
SPD 
SPE 
Addressed 
Commands 
GET 
GTL 
SDC 
lgnor&  Characters 
, 
comma 
space 
All other ASCII non-printing 
characters (except 
CR 
and 
LF) 
ERROR-PRODUCING CHARACTERS 
!"#$I()/:<=>; 
@I/] 
1 
- 
HIJKLMOQUV 
These 
two 
commands are complete in them- 
selves (except for string terminator). 
Each of these commands requires the single 
numeric digit (n). 
These 
characters are used for entering numbers 
Carriage Return 
Line Feed 
Group 
Exkute Trigger 
End Or Identify (used as 
ENDIDAB) 
My Listen Address 
My 
Talk Address 
Unlisten 
Untalk 
Attention 
Device Clear 
Interface Clear 
Local Loc&out 
Remote Ehable 
Serial Poll Disable 
Serial Poll Enable 
Group Execute Trigger 
Go To 
Lodl 
Selected bevice Clear 
These characters may be inserted anywhere in a 
character string without affecting the string. 
They carry no special meaning and are ignored by 
the 
8840A. They are not placed in the input buffer. 
The error annunciator is displayed 
on 
the 
8840A front panel when one of these 
characters is encountered (ERROR 71). 
Figure 
3-8. 
Interpretation 
of 
Messages 
J 
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