IEEE-488 Programming
5-12
cuted at that particular time, but they are stored within an
internal command buffer for later execution when the X
character is finally received.
If a particular command occurs “n” times in a command
string, then the “nth” occurrence is the only one used (i.e.,
T0T2T4X appears to the Model 708A as T4X).
Invalid commands
If an invalid command is sent as part of the command string,
no commands in the string are executed. Under these condi-
tions, the instrument displays a front panel error message
(IDDC or IDDCO), as described in paragraph 5.7, and it can
be programmed to generate an SRQ (Service Request), as
discussed in paragraph 5.9.12. Checking is done as syntacti-
cal groups of characters are received.
Valid command strings (typical samples)
A0X
Single command string.
A0T6X
Multiple command string.
P 0X
Space is ignored
Z15,0X
Multiple-option command string (options sepa-
rated by commas).
Invalid command strings (typical samples)
1X
Invalid command as 1 is not a valid command.
K7X
Invalid command option as 7 is not a valid
option of the K command.
CA400X
Invalid option (maximum column address is
60).
Z0100X
Multiple-option command without the neces-
sary separating commas.
Order of command execution
Device-dependent commands are not necessarily executed in
the order received. Rather, each instrument always executes
them in a specific order. The order of execution for the Model
708A is summarized in Table 5-10. Note that the X com-
mand is listed first since it is the character that forces the exe-
cution of the rest of the commands.
If you wish to force a particular order of execution, include
the execute (X) character after each command option group-
ing in the command string. For example, the following string
would be executed in the received order: T6XA1XR0X
Device-dependent command summary
All Model 708A device-dependent commands are summa-
rized in Table 5-11, which also lists respective paragraphs
where more detailed information on each command may be
found.
Table 5-10
Order of command execution
Order Command Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
X
R
L
E
I
Q
P
Z
V
W
N
C
A
B
F
G
J
K
M
O
S
T
U
Y
Execute DDCs.
Restore factory default conditions.
Download setups from controller to
Model 708A.
Set the edit pointer.
Insert a blank setup in memory.
Delete a setup from memory.
Clear all crosspoints at specified
setup.
Copy a setup from memory or relays
to memory or relays.
Select rows for make/break.
Select rows for break/make.
Open crosspoints of setup indicated
by edit pointer.
Close crosspoints of setup indicated
by edit pointer.
Select trigger edge of External Trig-
ger pulse.
Select logic sense of Matrix Ready
signal.
Enable/disable triggers.
Select data output format.
Execute ROM/RAM/display self-
test.
Select EOI and hold-off on X.
Set the SRQ mask.
Set the digital output.
Program the settling time.
Select the trigger source.
Request status.
Select terminator characters.
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