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M210282en-A
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:
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:
When the necessary settings have been given, close the line to transmitters
(the command closes all open lines):
CLOSE command is always given without address. If no lines are open, there
will be no response to the CLOSE command.
Appendix 4: RS 485/422 serial port module
open 22<cr>
HMP 22 line opened for operator commands
? <cr>
HMP228 / 1.01
CPU serial nr :
Keyboard type :
Address
:
7
Output units
:
Baud P D S
:
Serial mode
:
Output intrv. :
Mtim
:
32
Pressure :
1013.25
Analog outputs
Ch1
0.00 ...
Ch2
0.00 ...
Ch1
( aw )
lo
Ch1
( aw )
hi
Ch2
( T
)
lo
Ch2
( T
)
hi
Transducer
:
PRB serial nr :
Calibr. date
:
>close
line closed
0
0
metric
4800 E 7 1 FDX
STOP
0 min
10.00 V
10.00 V
0.000
1.000
-20.000 'C
180.000 'C
0
0
HMP228
85
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