Measurement Computing Serial488/4 - Manual (Page 34)

Section 1 Introduction
2.22
The Serial488/4 will continue to try to output its serial poll response until it
is serial poll disabled by the controller.
2.6.6 Serial Poll Disable (SPD)
Disables the Serial488/4 from responding to serial polls by the
controller.
2.6.7 Serial Poll Response
Whenever the Serial488/4 generates an SRQ, a serial poll of either the
command/status address or a serial data address w ill return a serial poll
status byte of at least 64 decimal show ing that an SRQ has been generated
by the Serial488/4. The status byte returned can be used to determine the
cause of the Service Request. These responses are explained in detail in
Section 3.
2.6.8 Unlisten (UNL)
UNL places the Serial488/4 in the Listener Idle State.
2.6.9 Untalk (UNT)
UNT places the Serial488/4 in the Talker Idle State.
2.7 Hardware Installation
Included with the Serial488/4 are accessories for rack or bench use. If rack
mount installation is required, install the tw o rack ears using the enclosed
screws. as shown in Figure 2-6. These ears can be installed so either the front or
the rear of the unit faces the front of the rack fixture.