6
Example 1
1I!
113METER
␣ ␣ ␣
TER21
␣
389631800001
Parameter
Fixed
Character
Length
Description
1I!
3
Data logger command
Request to the sensor for information from sensor address
1
.
1
1
Sensor address
Prepended on all responses, this indicates which sensor on the bus is returning
the following information.
13
2
Indicates that the target sensor supports
METER
␣ ␣ ␣
8
Vendor identification string
(
METER
and three spaces ␣ ␣ ␣ for all METER sensors)
TER21
␣
6
Sensor model string
This string is specific to the sensor type.
For the TEROS 21, the string is
TER21
.
389
3
Sensor version
This number divided by 100 is the METER sensor version
(e.g., 389 is version 3.89).
631800001
≤
13,
variable
Sensor serial number
This is a variable length field. It may be omitted for older sensors.
CHANGE ADDRESS COMMAND (
aAB!
)
The Change Address command is used to change the sensor address to a new address. All other commands
support the wildcard character as the target sensor address except for this command. All METER sensors
have a default address of
0
(zero) out of the factory. Supported addresses are alphanumeric (i.e.,
a
–
z
,
A
–
Z
, and
0
–
9
). An example output from a METER sensor is shown in
where the command is in
bold
and the
response follows the command
.
Example 2
1A0!
0
Parameter
Fixed
Character
Length
Description
1A0!
4
Data logger command.
Request to the sensor to change its address from
1
to a new address of
0
.
0
1
New sensor address.
For all subsequent commands, this new address will be used by the
target sensor.
ADDRESS QUERY COMMAND
(?!)
While disconnected from a bus, the Address Query command can be used to determine which sensors are
currently being communicated with. Sending this command over a bus will cause a bus contention where all
the sensors will respond simultaneously and corrupt the data line. This command is helpful when trying to
isolate a failed sensor.
shows an example of the command and response, where the command is in
bold
and the response follows the command. The question mark (
?
) is a wildcard character that can be used in
place of the address with any command except the Change Address command.
Example 3
?!
0
Parameter
Fixed
Character
Length
Description
?!
2
Data logger command.
Request for a response from any sensor listening on the data line.
0
1
Sensor address.
Returns the sensor address to the currently connected sensor.
