Umwelt-Geräte-Technik GmbH
| Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 |
Software/Hardware:
Depending on the program and the hardware (e.g. dataTaker or a windows based PC) the correct syntax
depends on the program
’s
internal communication protocol.
Communication protocol:
The logger communication protocol is based on the fact that the data logger acts as the only master on
the RS485-Bus and the sensors act as slaves. In consequence, requests are only committed by the master
and answered by the addressed slave (Response).
The data is transmitted in the form of ASCII - coded characters. The control character
0x0D
(or
CR, \r
)
shows the end of the line and varies depending on the software/hardware that is used.
Every physical value (pressure, temperature
…
) recorded by the Full Range Tensiometer is readable via
an own address.
Table of commands:
Command
GSN
get serial number
GADx
get bus address of measurement channel x
GAD1
reading
bus address
of
measurement channel
1
„
service/calibration
“
GAD2
reading
bus address
of
measurement channel
2
„
temperature
“
GAD3
reading
bus address
of
measurement channel
3
„
pressure
“
GAD4
reading
bus address
of
measurement channel
4
„
service/ calibration
”
OPx
open bus address x
communicate with measurement
channel having the bus address x
*
OP0
open all bus addresses of connected
FRTs
communicate
with
all
measurement channels of all
connected FRTs*
OP+serial
number
Open FRT with specific serial number communicate with a FRT with a
known serial number
GN
get raw measurement value (specify
bus address
by using OPx)
SADx y
set
bus address
of a
measurement channel
x to y
Answer
OK
received request and ready to answer
„100“
bus address
of
measurement channel
„009000“
requested raw measurement value
* Will not work for retrieving value for multiple measurement channel. Should only be
used if a specific channel in addressed in the second command (e.g. GADx,GSN)
