
44
OP Operating Mode Parameters
Sets the
OP
erating mode parameters for the number of decimal places, checksum usage, and sequential read control
for pressure readings. It also controls the built-in watchdog timer feature. If enabled, the watchdog timer will perform
an automatic system reset, similar to an IN=RESET command, if the HPB becomes interrupted due to external
influences. This option is useful in applications that are subject to electrical noise, power glitches, electrostatic
discharges, etc., or where high reliability is required. (Default:
OP=ANEX
)
Inquiry:
*dd
OP
Action:
*dd
WE
EEPROM Store: *dd
WE
*dd
OP=
{
A
|
U
} or *dd
OP=
{
N
|
C
} or
*dd
SP=ALL
*dd
OP=
{
E
|
R
|
S
} or *dd
OP=
{
O
|
P
|
X
|
W
}
A
Transmit all readings for sequential requests and continuous mode.
U
Transmit only changed pressure readings for sequential requests and continuous mode.
Note:
See
DS
command for controlling the amount of pressure deviation that is detected as a
change. See
RR
command to skip identical readings. Upon receipt of a
P2
or
P4
command, the
HPB will send one reading and then wait for a pressure change before sending another.
................................................................................................................
N
N
o checksum.
C
Apply an integrity
C
hecksum to the binary format readings. When all of the characters in the
message, including the header and this character, are added together (without carries) the least
significant 6 bits of the resultant sum will be zero. Do not include the <cr>; that is, if you add the
6 least significant bits of theheader, 4 data, and checksumcharacters, without any carries, the
6 least significant bits will be zeroes (see Table 3 for the list of characters to be used.)
................................................................................................................
E E
xtended form for the commands (
P3, P4
) using the binary format. This yields a 7 bit binary
device address and a 17 bit magnitude for the pressure reading. The pressure sign is encoded in
the header character. This allows up to 90,000 counts in the pressure A/D conversion cycle, and
allows digital readings (
P1, P2
) up to a full scale value of 90,000 to use five significant digits.
R
R
emove header characters from
P1
and
P2
pressure readings. Provides the same function as
E
option above. In this mode, there is no device ID number or indication of out-of-range
pressure condition in the
P1
and
P2
modes.