Appendix l special emulation mode, Pa11a, P mode – Vaisala PTB220 User Manual
Page 109: P mode automode
A
PPENDIX
L ____________________________________________________
SPECIAL EMULATION
M
ODE
V
AISALA
________________________________________________________________________ 103
APPENDIX L SPECIAL EMULATION MODE
The PTB220 series digital barometers can partially emulate the
PA11A and the Setra 470 digital barometers. To activate the desired
emulation mode first turn the power off, then make the given switch
selections and switch barometer on again.
PA11A
The PTB220 series digital barometers can partially emulate the
PA11A digital barometers. Any serial bus and measurement related
software settings must be done before selecting the emulation mode.
P Mode
The P mode just sets the PTB220 series barometer to output the
message type 1 of serial mode 2 of the barometer. Please note the
capital letter P in the command. The dip switch settings should be as
in
F
IGURE
L-1
.
F
IGURE
L-1
PA11A emulation P mode
Message 1 format is as follows:
1
P
1
P
1
P
1
P
1
2
P
2
P
2
P
2
P
2
3
P
3
P
3
P
3
P
3
P
a
P
a
P
a
P
a
P
a
where;
P
1
P
1
P
1
P
1
P
1
Pressure transducer 1 (with 5 characters)
P
2
P
2
P
2
P
2
P
2
Pressure transducer 2 (with 5 characters)
P
3
P
3
P
3
P
3
P
3
Pressure transducer 3 (with 5 characters)
ssssssss
Average status. 10000000 means OK with all three
transducers included. Otherwise, the last three bits
of the status will indicate the transducers that are
included when calculating the average e.g. status
00000110 means that transducers 2 and 3 are
included and 1 ignored.