Communications Monitor - Ametek 7280 Instruction Manual

Chapter 5, FRONT PANEL OPERATION

5.3.17 Communications Monitor

5-32
Bit Decimal Value Status Byte
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Hence, for example, if the SRQ mask byte is set to decimal 16 (i.e. bit 4 asserted), a
service request would be generated as soon as an overload occurred; if the SRQ mask
byte were set to 0 (i.e. no bits asserted), then service requests would never be
generated.
TEST ECHO
When this control is enabled, all transmissions to and from the instrument via the
GPIB interface are echoed to the RS232 interface. Hence if a terminal is connected to
the latter port, it will display any commands sent to the instrument and any responses
generated, which can be useful during program development. When disabled,
echoing does not occur. The control should always be disabled when not using this
feature, since it slows down communications.
DELIMITER
The character shown is that sent by the lock-in amplifier to separate two numeric
values in a two-value response, such as that generated by the MP command. The
corresponding ASCII value of this character is also shown in brackets. For example,
value 44 corresponds to a "," (comma).
Pressing the Previous Menu key returns control to the Configuration Menu, and
pressing the Communications Monitor key accesses the Communications Monitor
display.
When the Communications Menu is displayed, pressing the Communications monitor
key accesses the Communications monitor display, shown in figure 5-21. It may also
be accessed via the RS232 Settings and GPIB Settings menus.
command complete
invalid command
command parameter error
reference unlock
overload
new ADC values available
after external trigger
asserted SRQ
data available