Umwelt-Geräte-Technik GmbH
| Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 |
Commands are usually given in the following structure:
[
COMMAND
]
[
BUSADDRESS
OR
CHANNELNUMBER
][
RETURNCHARACTER
]
e.g.:
OP
1
\r
–
communicate with
measurement channel
having the
bus address
1
(Example: bus address 1
→
FRT 1,
measurement channel 2 “temperature”)
GAD
3
\r
–
Get
bus address
of
measurement channel
3
(Example: FRT 1;
measurement channel
3 “pressure”
→
bus address
2)
For each command of the master (logger/pc) there will be an answer from the slave (FRT). The answer
can either be of the data type float (a decimal number; eg. measurement value, bus addresses, serial
number) or string (multiple characters eg. Device type, generic answer):
[
ANSWER
][
RETURNCHARACTER
]
e.g.:
OK
\r
–
received request and ready to answer
100
\r
–
bus address of measurement channel
(Example: FRT 3;
measurement channel
2 “temperature”
→
bus address
100)
Start communication:
The previously shown command
OPx
tells the FRT which address you want to communicate with.
OP0
addresses all channels of all connected FRTs. For the case that no address is known and you want to
communicate with a FRT with a known serial number, you can sw
itch the command “OP
1\
r“ in the
example above with the command “OP+Serialnumber
\
r” (e.g. OP201500101
\r).
Obtaining an address:
The bus address for a specific channel can be obtained with the command
„GAD”.
(send line by line)
Master
Sensor
OP
0
\r
OK
\r
GAD
2
\r
100
\r
(Example: FRT 3;
measurement channel
2
“
temperature
”
→
bus address
100
.)
