HP 3336A - Page 52

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Model 3336A/B/C
3-155. Masking Service Requests. At instrument turn-on, all four SRQ conditions are
masked (disabled) from generating a Request Service Message. The true states of these four
conditions are encoded into the Status Byte (bits 0 thru 3). Any combination of these four
conditions can be enabled by sending one of the following Program Instruction Codes:
Instrument Program
Programming Error
Codes (ASCII) Bit 0
MS@ Mask Mask Mask Mask
MSA Mask Mask Mask Enable
MSB Mask Mask Enable Mask
MSC Mask Mask Enable Enable
MSD Mask Enable Mask Mask
MSE Mask Enable Mask Enable
MSF Mask Enable Enable Mask
MSG Mask Enable Enable Enable
MSH Enable Mask Mask Mask
MSI Enable Mask Mask Enable
MSJ Enable Mask Enable Mask
MSK Enable Mask Enable Enable
MSL Enable Enable Mask Mask
MSM Enable Enable Mask Enable
MSN Enable Enable Enable Mask
MSO Enable Enable Enable Enable
3-156. Formats for Instrument programming Codes. The format for the programming
codes is identical to the front panel (manual) operation. A unique one, two or three ASCII
character programming code is sent to the instrument to activate the same functions that are
activated by front panel switches in manual operation. For example, the instruction AB1
programs
Amplitude
Blanking
ON.
While
the
characters
comprising
each
programming
code must be received in a certain order, the order in which the programming codes are
received is not important. Sending ‘‘ABO, FL1, MP1”’ or ‘‘MP1, FL2, ABO” result in the
activation of the same functions, Amplitude Blanking OFF, Fast Leveling ON, and Phase
Modulation ON, but in reverse order. Note, the -hp- 3336 ignores commas and spaces. They
are included for operator clarity.
3-157. When the -hp- 3336 is in the Local mode, certain instrument functions are set using
SEVERAL front panel controls. For instance, to enter Frequency, the FREQUENCY key,
the appropriate digits including the decimal point, and then the appropriate frequency
UNITS key (MHz, kHz, Hz) is pressed. Obviously, the order in which the controls are ac-
tuated is important. When operating in the Remote mode, the same method is used to set the
Entry Frequency except that ASCII characters are sent over the HP-IB to activate the instru-
ment functions instead of pressing front panel controls. The ASCII character group ‘‘FR”’
activates the function controlled by the FREQUENCY key, ASCII digits correspond to the
digit keys and the ASCII character groups ‘‘MH”’, ‘‘KH’’, ‘‘HZ”’ correspond to the MHz,
kHz and Hz units keys. For example, to program the -hp- 3336 to output 12.534 763 MHz,
the ASCII character group ‘“FR12.534763MH”’ is sent. As before, the order within the
character group is important, however, the character group can be placed anywhere within a
larger group of instrument instructions.
Operation
3-31