GPIB
370B User Manual 4-7
My Listen and My Talk Address (MLA and MTA). The 370B’s address is established
by setting the address select switches on the rear panel. When the 370B receives
its own address along with either of these commands, it responds by entering the
appropriate state: ready to talk or ready to listen.
Attention (ATN). With the ATN line asserted, data on the eight data lines is
interpreted as an address or interface message. With most controller program-
ming languages, operation of the ATN line is transparent to the user.
Unlisten (UNL) and Untalk (UNT). When the Unlisten (UNL) message (ASCII “?”,
decimal 63) is received, the 370B listen function is placed in an idle (unad-
dressed) state. In the idle state, the 370B will not accept messages over the
GPIB. The Talk function is placed in an idle state when the curve tracer receives
the Untalk(UNT) message (ASCII “_”, decimal 95). In this state the 370B cannot
transmit data via the GPIB.
Interface Clear (IFC). When the interface clear (IFC) line is asserted, both the Talk
and Listen functions are placed in an idle state. This produces the same effect as
receiving both the Untalk and Unlisten commands. It resets the interface only,
clearing the input and output buffer, and does not affect any instrument func-
tions. This can be used to restart communication with the 370B.
Device CLear (DCL). The Device clear (DCL) message (ASCII “Control T”,
decimal 20) reinitializes communication between the 370B and the controller. In
response to Device Clear, the 370B clears any input and output messages as well
as any unexecuted control settings. Any errors and events waiting to be reported,
except power-up, are also cleared. If the SRQ line has been asserted for any
reason other than power-up, it becomes unasserted when DCL is received.
Selected Device Clear (SDC). The Selected Device clear (SDC) message (ASCII
“Control D”, decimal 4) performs the same function as DCL. However, only
instruments that have been listen-addressed respond to SDC.
Go To Local (GTL). The Go To Local (CTL) message (ASCII “Control A”,
decimal 1) returns the 370B to the front panel and turns off the front panel
REMOTE indicator, just as the front panel LOCAL button does.
Remote Enable (REN). When the Remote Enable (REN) line is asserted and the
instrument receives its listen address (MLA), the 370B is placed in its Remote
State (REMS) and the front panel REMOTE indicator is turned on.
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General