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CHAPTER 5: Peripheral Operation
5.6.1 M
Y
T
ALK
A
DDRESS
(MTA)
When the interface converter is addressed to talk, it retrieves data from
the serial input buffer and outputs it to the IEEE 488 bus. It substitutes the
selected IEEE bus terminators for the received serial terminators. The inter-
face converter will continue to output serial input buffer data as long as the
IEEE controller allows.
5.6.2 M
Y
L
ISTEN
A
DDRESS
(MLA)
When the interface converter is addressed to listen, it accepts data from the
active talker and outputs this data through the serial interface. It substitutes
the selected serial terminators for the received IEEE bus terminators.
5.6.3 D
EVICE
C
LEAR
(DCL
AND
SDC)
Device Clear resets the interface converter’s IEEE input and serial input
buffers. Any pending data and Service Requests (SRQ), including the
information they convey, are lost.
5.6.4 I
NTERFACE
C
LEAR
(IFC)
IFC places the interface converter in the Talker/Listener Idle State. It clears
any pending requests for service (SRQ). The condition which caused the SRQ
remains unmodified.
5.6.5 S
ERIAL
P
OLL
E
NABLE
(SPE)
When Serial-Poll-Enabled, the interface converter sets itself to respond to a
serial poll with its serial-poll status byte if addressed to talk. When the serial-
poll byte is accepted by the controller, any pending SRQs are cleared. The
interface converter will continue to try to output its serial-poll response until
it is “Serial-Poll-Disabled” by the controller.
5.6.6 S
ERIAL
P
OLL
D
ISABLE
(SPD)
Disables the interface converter from responding to serial polls by the
controller.
5.6.7 U
NLISTEN
(UNL)
UNL places the interface converter in the Listener Idle State.
5.6.8 U
NTALK
(UNT)
UNT places the interface converter in the Talker Idle State.