Vaisala HMP228 - Manual (Page 91)

HMP228
M210282en-A Appendix 4: RS 485/422 serial port module
85
4. CHECKING THE SERIAL PORT NETWORK OPERATION
Normally measurement readings are asked when the transmitter is in POLL
mode; then the command must include the address of the transmitter. If the
settings of the transmitter need to be changed, the transmitter is switched to
STOP mode with command OPEN; commands can then be given without
address. When the line to the transmitter is closed, it returns to POLL mode.
STOP mode
Open the line to the transmitter:
open 22
HMP 22 line opened for operator commands
Transmitter no. 22 is now temporarily set to STOP mode; it accepts com-
mands sent without address until CLOSE command is given. Individual set-
tings can now be easily modified. Do not open more than one line at a time.
Use command ? to find out the settings of the active transmitter:
?
HMP228 / 1.01
CPU serial nr : 0
Keyboard type : 0
Address
: 7
Output units : metric
Baud P D S : 4800 E 7 1 FDX
Serial mode : STOP
Output intrv. : 0 min
Mtim
: 32
Pressure : 1013.25
Analog outputs
Ch1 0.00 ... 10.00 V
Ch2 0.00 ... 10.00 V
Ch1 ( aw ) lo 0.000
Ch1 ( aw ) hi 1.000
Ch2 ( T ) lo -20.000 'C
Ch2 ( T ) hi 180.000 'C
Transducer :
PRB serial nr : 0
Calibr. date
: 0
When the necessary settings have been given, close the line to transmitters
(the command closes all open lines):
>close
line closed
CLOSE command is always given without address. If no lines are open, there
will be no response to the CLOSE command.