2 response, 3 bus states – Measurement Computing Micro488/p User Manual
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09-27-02
Command Descriptions
3.2.2 Response
This portion of the command description describes the response that the user's
program should read from the serial host's COM port after sending the command. If
a response is provided, it must be read to maintain proper program seqence.
3.2.3 Bus States
This portion of the command description describes the bus command and data
transfers using IEEE bus mnemonics as listed in the following table.
Bus States
DIO lines
8
7
6
5
4
3
2
1
ATN
Attention
data
Data String
DCL
Device Clear
x
0
0
1
0
1
0
0
GET
Group Execute Trigger
x
0
0
0
1
0
0
0
GTL
Go To Local
x
0
0
0
0
0
0
1
IFC
Interface Clear
LAG
Listen Address Group
x
0
1
a
d
d
r
n
LLO
Local Lock Out
x
0
0
1
0
0
0
1
MLA
My Listen Address
x
0
1
a
d
d
r
n
MTA
My Talk Address
x
1
0
a
d
d
r
n
REN
Remote Enable
SDC
Selected Device Clear
x
0
0
0
0
1
0
0
SPD
Serial Poll Disable
x
0
0
1
1
0
0
1
SPE
Serial Poll Enable
x
0
0
1
1
0
0
0
SRQ
Service Request
TAG
Talker Address Group
x
1
0
a
d
d
r
n
UNL
Unlisten
x
0
1
1
1
1
1
1
UNT
Untalk
x
1
0
1
1
1
1
1
x = "don't care"
addrn = IEEE bus address “n”