Operation Model 8642A/B
Operating Messages (cont'd)
Prompt Messages
Local: These messages are automatically displayed when you execute a function.
HP-IB:
Most of these messages can be output via HP-IB using the Output Display capability after you
execute a function. P91 cannot be read via HP-IB.
Prompt messages (message code is prefixed with "P") instruct you towards completion of the task or
function selection you began.
SPCLS OFF. ENTER NUMBER PO
All special functions are off. To select a special function, select its number.
HIT MSSG FOR EACH MSSG PI 1501
More than one message is in the message list, select
1
MSSG 1 (HP-IB code: MG) to see each message.
HP-IB:
Note that when retrieving a message list using the "OH" command when more than one message
exists,
this is the first message you will receive in the list. Refer to the Output Messages discussion that
begins on page 3-17 in the HP-IB portion of this Section III. For information about re-reading the
copied message list, refer to "Queued Up Messages" on page 3-1 80.
OFF/ON SELECTS EMF ON P2
The EMF mode is off. Select
1
OFF ON I (HP-IB: EMON) to select EMF on.
OFF/ON SELECTS EMF OFF P3
The EMF mode is on. Select
1
OFF ON I (HP-IB: EMOF) to select EMF off.
HIT OFF/ON = HOLD FUNC .P4
Knob Hold is off, to hold the active function on the Knob, select [ OFF ON~1.
HP-IB:
Send the HP-IB code of the desired active function followed by KHON.
HIT OFF/ON = HOLD OFF P5
Knob Hold is on, to turn off the Knob Hold function, select R5FT~OTn (HP-IB: KHOF).
USE KNOB/UP/DN/r;UMBER Pll
The Help function allows you to view the descriptions and code numbers of special functions. Select
either the Knob, Step keys, or a function's number.
RELEASE ALL KEYS P91
Release all keys. At turn on, it appears that a key is being held down. Release all keys to continue. If a
key is not being held down, your instrument may need servicing (refer to the Service Manual). This
message cannot be read via HP-IB using Output Display because it automatically clears from the display
after the key is released. Also, HP-IB operation is halted when a key is held down with this message
displayed.
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