Rh eo n i k M esst ech n i k
RE V . L O ct o b er 2014
.
RHEONIK Coriolis Flowmeter
Operation Manual RHE 07, 08, 11
Page
21
- Request command termination:
<CR><LF><7FH><7FH>
- RHE reply termination:
<7FH><7FH><CR><LF>
CR: carriage return
LF: line feed
7FH: character for synchronizing serial DataStream (hexadecimal)
- Commands:
There are also some commands that are sent to the transmitter without request for spe-
cial measurement data.
These commands must also be sent like the request instructions between the command
head and the command termination:
instruction
command
transmitter reply
________________________________________________________________
reset totalizer
r
r
hold on totalizer
hon
hon
hold off totalizer
hoff
hoff
clear error
c
c
2.1.3.6.3. External contact inputs
The RHE electronic offers two possible inputs. Both are galvanically isolated and are
passive. This means that in order to activate the inputs, the opto isolators LED’s have to
be switched using an external support voltage of maximum 24 VDC (R = 2700 Ohm).
Example:
resist or
Op t ocoupler
DC v olt ag e
m ax . 2 4 V
ex t er nal cont act inp ut
( sw it ch, r elay )
Both inputs can be programmed by software keys as:
- Not used
(if the input is not used)
- Reset Total
(set totalizer to zero)
- Hold Total
(block totalizer counting during flow)
- Zero Flow
(start zero calibration procedure)
- Quit Error
(acknowledge error message)
- Batch Start
(only with activated Batch Option)
- Batch Stop
(only with activated Batch Option)
