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SEZ
Hz Ha HS
T1 T2 T= DTa
AH value
[cal value]
OC [slot, value)
OS (slot, value]
OH [number 0-29]
LS <channel list>
LF<channel list>
FM[value]
MH <bit>
ML <bit>
Mt <slot>
FH
1
LIC <channel>
sk value)
HP 3421A Command Reference
Autozero off (Z0) or on (Z1).
Number of digits of resolution: N3=3 1/2, N4=41/2 N§S=S5§1/2
Trigger: TO = hold trigger and enable channel list scan; T1 = internal
trigger; T2 = software single trigger; T3 = triggers measurements from
channel list and stores readings; DTa = digital trigger, triggers when
digital input bit 'a' goes low.
AND mask, used with the MN command.
Calibrate, refer to the HP 3421A Data Acquisition/Control Unit Service
Manual.
Digital clear specified output bits.
Digital set specified output bits.
Display number. Note: send DN alone to turn off display number mode.
Load single channels into channel list.
Load channel pairs into channel list.
Set SRQ mask.
Monitor digital input bit and SRQ interrupt when the bit goes high.
Monitor digital input bit and SRQ interrupt when the bit goes low.
Monitor slot and compare to AN mask and XR mask. SRQ interrupt
when result is zero.
Autorange off (RAO) and Autorange on (RA).
Read channel list.
Reset the HP 3421 A to power on state.
Initialize channel list pointer to beginning of list.
Opens channel and closes next channel in list.
Read status registers.
Unconditionally close specified channel.
Exclusive OR mask, used with the [ll command.
B-3
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