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menu) sends the HP-GL command string to the analyzer’s HP-GL address. The address of the
analyzer’s HP-GL graphics interface is always offset from the instrument’s HP-IB address by 1:
n
If the current instrument address is an even number:
HP-GL address = instrument address + 1.
n
If the current instrument address is an odd number:
HP-GL address = instrument address -1.
Special Commands
Two HP-GL commands require special consideration when used in local operation or in
sequencing. These are explained below:
Plot absolute (HP-GL command: PA)
The syntax for this command is
PAx,y
where x and y are screen location coordinates
separated by a comma.
Label (HP-GL co
mman&
Ia)
The syntax for this command is LB(text][etx]. The label command will print ASCII characters
until the etx command is seen. The etx is the ASCII value 3 (not the ASCII character 3).
The analyzer title function does not have the ASCII value 3, so the instrument allows the LB
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Entering
Sequences Using HP-IB
You can create a sequence in a computer controller using HP-IB codes and enter it into the
analyzer over HP-IB. This method replaces the keystrokes with HP-IB commands. The following
is a procedure for entering a sequence over HP-IB:
1. Send the HP-IB command
NEWSEQx
where x is a number from 1 to 6.
2. Send the HP43 commands for the measurement.
3. Terminate with the HP-IB command
BONM
(done modify).
Reading Sequences Using
HP-II3
An external controller can read the commands in any sequence (in HP-IB command format).
Send the following command to the analyzer:
OUTPSEQx
where x is a number from 1 to 6.
Allocate an adequate amount of string variable space in the external controller and execute an
ENTER statement.
6-162
Application and Operation Concepts