Tektronix WCA230A, Programmer'S Manual

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Appendix B: GPIB Interface Specification
B- 4
WCA230A & WCA280A Programmer Manual
H
Device Clear (DCL). Will clear (initialize) all devices on the bus that have a
device clear function, whether or not the controller has addressed them.
H
Local Lockout (LLO). Disables the return to local function.
H
Serial Poll Disable (SPD). Changes all devices on the bus from the serial
poll state to the normal operating state.
H
Serial Poll Enable (SPE). Puts all bus devices that have a service request
function into the serial poll enabled state. In this state, each device sends the
controller its status byte, instead of its normal output, after the device
receives its talk address on the data lines. This function may be used to
determine which device sent a service request.
H
Go To Local (GTL). Causes the listen-addressed device to switch from
remote to local (front-panel) control.
H
Select Device Clear (SDC). Clears or initializes all listen-addressed devices.
H
Group Execute Trigger (GET). Triggers all applicable devices and causes
them to initiate their programmed actions.
H
Take Control (TCT). Allows the controller in charge to pass control of the
bus to another controller on the bus.
H
Parallel Poll Configure (PPC). Causes the listen-addressed device to respond
to the secondary commands Parallel Poll Enable (PPE) and Parallel Poll
Disable (PPD), which are placed on the bus following the PPC command.
PPE enables a device with parallel poll capability to respond on a particular
data line. PPD disables the device from responding to the parallel poll.