5502A
Operators Manual
5-38
Each status register and queue has a summary bit in the Serial Poll Status Byte. Enable
registers are used to mask various bits in the status registers and supply summary bits in
the Serial Poll Status Byte. For IEEE-488 interface operation, the Service Request Enable
Register is used to assert the SRQ control line on detection of status condition or
conditions the programmer chooses. For RS-232 interface operation, the SRQSTR string
is sent over the serial interface when the SRQ line is set. (See the
SRQSTR
command
description in Chapter 6.)
Serial Poll Status Byte (STB)
The Calibrator sends the serial poll status byte (STB) when it responds to a serial poll.
This byte is set to 0 when the power is turned on. The STB byte is specified as shown in
Figure 5-9. If you use the RS-232 as the remote control interface, transmitting the ^P
character (in the Terminal mode, hold down the <Cntl> key and push P) gives the
SPLSTR (Serial Poll String) and the status byte. Refer to the
*STB
command, and for
RS-232 interface operation, the
SPLSTR
and
SPLSTR?
commands, in Chapter 6 for
more information.
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