Valhalla 2300, Operation Manual

Page: 52 / 115

7-7-4. Channel Selection Commands
These commands are used to select which
channel's data (
∅
A,
∅
B, or
∅
C) is displayed
on the 2300 and available via the bus.
Examples:
OUTPUT 715;"W0" Selects
φ
A
OUTPUT 715;"W1" Selects
φ
B
OUTPUT 715;"W2" Selects
φ
C
OUTPUT 715;"W3" Selects 3
φ
, 3-wire mode
OUTPUT 715;"W4" Selects 3
φ
, 4-wire mode
7-7-5. Output Data Selection Queries
These queries select which measurement data
will be made available to the controller on the
next read. Once selected, that data is returned
on all subsequent reads of the controller.
Examples:
OUTPUT 715;"T0" Selects Voltage Data
OUTPUT 715;"T1" Selects Current Data
OUTPUT 715;"T2" Selects Power Data
OUTPUT 715;"T3" Selects Average Power Data
OUTPUT 715;"T4" Selects Watt-Hour Data
Notes: The output data is invalid for the T0
and T1 queries if the W3 or W4 command has
been selected. Also, refer to section 7-7-9 for
more details on the T3 and T4 queries.
7-7-6. Output Data Terminators
These codes determine the "output data
terminator" that will alert the controller to the
end of any data returned by the 2300:
Examples:
OUTPUT 715;"D0"
C
R
and
L
F
(default)
OUTPUT 715;"D1"
C
R
and
L
F
with EOI
OUTPUT 715;"D2"
C
R
OUTPUT 715;"D3"
C
R
with EOI
OUTPUT 715;"D4" EOI
OUTPUT 715;"D5"
L
F
7-7-7. SRQ and Serial Poll Commands
The 2300 may assert the SRQ wire if it
receives an undecipherable command. This
function is enabled or disabled by the
commands below.
Examples:
OUTPUT 715;"Q0" Disables the 2300 SRQ
OUTPUT 715;"Q1" Enables the 2300 SRQ
When the system controller conducts a serial
poll, the 2300 responds with a non- zero byte
of data informing the controller of the reason
for the SRQ. If the 2300 did not generate the
SRQ, a zero byte is used as the response.
7-7-8. Programming Status Query
This query causes the 2300 to return its
"configuration status word" instead of the
selected measurement data the next time it is
read by the controller. This status word
contains data regarding the current settings of
certain parameters such as range information
and data terminators.
After receiving the query "
E ", the 2300
makes the status word available. No other
data is available until this word is read. The
configuration status word is in the format:
QnVnInWnDnTn
where the letters correspond to the commands
described previously, and "n" refers to the
current number relating to that command.
For example,
Q0V2I1W2D0T0
would indicate that the 2300 is in the 300V
and 0.5A ranges, with the volts data for
φ
C