Technical and instalation
manual FLOW 38 Batch Page 32 (of 49) COMAC CAL
s.r.o.
Settings of dose range
There are two parameters for setting the dose range. According to these parameters, we can then
determine the dose size with a rotary potentiometer on the body of the device. The choice of the
maximum limit automatically affects the resolution in which the dose can be set so that the value set
by the rotary element is stable - usually the value can be set to 3 valid digits (999 positions of the rotary
switch). E.g. at a dose of 1000 liters, it will be possible to set the dose only in steps of 10 liters, etc.
The setting is then carried out in the usual way by changing the dose value in m
3
for the minimum limit
and then the maximum limit.
Communication
If the flow meter is ordered with communication, it is possible to choose either MODBUS-RTU or
MBUS protocols. RS485 is the physical layer of both protocols. In MODBUS-RTU protocol, it is possible
to set parity and the number of stop bits. The parity of MBUS protocol is fixed to EVEN and the number
of stop bits to 1. Due to the existing requirements for MBUS protocol and MBUS physical layer, it is
necessary to use an interior expansion card. In this case, besides parity and stop bits, the transfer rate is
fixed to 2400Bd as well.
The flow meter address can be in the range of 0 – 255. The MBUS protocol supports the broadcast
address 254.
If communication was not ordered.
Address 0 - 255
Transfer rate 1200Bd –
9600Bd
E – even
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