D-9
Table D-4
Typical common command sequence
Data bus
Step
Command
ATN state
ASCII
Hex
Decimal
1
UNL
Set low
?
3F
63
2
LAG*
Stays low
’
27
39
3
Data
Set high
*
2A
42
4
Data
Stays high
R
52
82
5
Data
Stays high
S
53
83
6
Data
Stays high
T
54
84
Assumes primary address = 7.
Table D-5
IEEE command groups
HANDSHAKE COMMAND GROUP
NDAC = NOT DATA ACCEPTED
NRFD = NOT READY FOR DATA
DAV = DATA VALID
UNIVERSAL COMMAND GROUP
ATN = ATTENTION
DCL = DEVICE CLEAR
IFC = INTERFACE CLEAR
REN = REMOTE ENABLE
SPD = SERIAL POLL DISABLE
SPE = SERIAL POLL ENABLE
ADDRESS COMMAND GROUP
LISTEN
LAG = LISTEN ADDRESS GROUP
MLA = MY LISTEN ADDRESS
UNL = UNLISTEN
TALK
TAG = TALK ADDRESS GROUP
MTA = MY TALK ADDRESS
UNT = UNTALK
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