User's Guide _______________________________________________________________________
70
______________________________________________________ M210296en-A
This format is also used when several devices are on the same line.
Use character 1 as the
id
if the
id
has not been set but a specific
message type is polled.
The FD12P does not echo the polling character string.
The answer message format is the following:
<SOH> FD <SP> id <STX> text <ETX><CR><LF>
The
id
field always contains two characters. If only one character has
been set as the
id
, the sensor will output an <SP> as the first character
in the field.
When there are several devices on the same line, the polled unit turns
the modem (DMX21) carrier on after it has acknowledged the request.
When the carrier is switched on, additional characters will appear
before the <SOH>
(01 hex) character. The FD12P waits about 100 ms
after turning the carrier on before it starts to send the message. When
the FD12P has sent the message, it turns the carrier off. This will also
generate additional characters, which have to be ignored by the host.
FD12P Command Set
HELP Command
The operator receives information about available commands by
typing
HELP
↵
The HELP command sets are listed in Table 18 below.
Table 18
HELP Command Sets
Command
Description
OPEN
Assigns the line for operator commands
CLOSE
Releases the line for automatic messages
MES
Displays data message
AMES
Number Interval
Automatic message
(with parameters Number and Interval)
STA
Displays status
PAR
Parameter message
WPAR
Weather parameter message
PRW
Present weather message
CONF
Password
Updates configuration
CLEAN
Sets clean references
