Telecommunications Techniques Corporation interceptor 147, Справочное руководство, Страница: 247 / 280

C-3
C
Remote Control Status Registers
INTERCEPTOR 147 2 Mbit/s and Data Analyzer
C.2 QUEUE AND BUFFER OPERATION
All responses that the INTERCEPTOR 147 generates are
placed in the Output Queue. With RS-232 Remote Control
operation, the contents of the Output Queue are immediately
transmitted to the terminal. When a response is in the
Output Queue, the Message Available indicator bit 6 of
the Status Byte Register is set to 1.
Printouts generated by the INTERCEPTOR 147 may be
sent to an internal buffer called the RC Print Queue. An
available print in the RC Print Queue sets the Print
Available indicator bit 6 of the Status Byte Register to 1.
This ability is enabled through the command SYSTEM:RC
PRINT. Users may read the printouts by using the
STATUS:PRINT? query.
The Error Buffer is an internal buffer used to store the last
generated error message. The Error Buffer is read using
the STATUS:ERROR? query and is cleared using the
STATUS:CLEAR_ERR command. When an error
message is present in the Error Buffer, the Error Available
indicator, bit 0 of the Status Byte Register, is set to 1. Error
messages are also transmitted directly to the terminal in
RS-232 terminal mode operation.
C.3 STATUS BYTE REGISTER GROUP
The Status Byte Register group summarizes the data
structures reporting to it, and consists of two 8-bit registers:
Status Byte Register and Status Byte Enable Register. See
Figure C-3.
The Status Byte Register contains summary bits from the
data structures that report to it. Each bit reports whether
a specific event or condition has occurred. The
INTERCEPTOR 147 defines 6 of the 8 bits in the Status
Byte Register; the other 2 bits are always set to 0.