76
SeCtion b
SoFtware Manual
RetuRn to toC
MaCe HydRoMaCe 3000
Product Manual
77
RetuRn to toC
23.2.2 MODBUS Mode
The MODBUS implementation complies with the
MODBUS over Serial Line
Specification V1.0
and
MODBUS Application Protocol Specification V1.1.
The external port is either a standard
“RS232”
port or a two-wire
“RS485”
port, depending on the selected MODBUS mode. The MODBUS parameters
are configurable by entering the appropriate
“Address”
, selecting the correct
“Baudrate”
from the drop down list and checking the required radar buttons.
WarNINg: the user must ensure that there are no two devices
with the same address on the same bus. In such a case, the
behaviour of the bus is unpredictable
23.1 Configuring a FloSI
-
Continued
4.
Click “
Change”
and the
“Select
output mode”
dialogue box will
appear.
5.
From the drop down list
select the output mode you
wish to use. Click
“Apply”
and
the updated
“FloSI settings”
dialogue box will appear.
Select output mode
23.2 Serial Interface Settings
The FloSI can only be configured to use one serial protocol from the three
available. The parameter values are provided in the user configured units.
23.2.1 RS-232, ASCII Mode
The line transmission characteristics are as follows:
Baud rate:
9600
Data bits:
8
Parity:
None
Stop bits:
1
In this mode, the FloSI is dormant while RTS is inactive. On RTS going active,
the FloSI transmits the most current result string from the HydroMace 3000. If
RTS is active when a scheduled sample is made, then the string is transmitted
immediately on completion of the measurement.
The transmitted ASCII text string starts with the character ‘ * ‘(asterisk), ends
with a carriage return and contains the configured number of channel
values. The number and order of channel values in the output string can be
configured using Flocom
+
. Each channel value in the string always begins with
either a ‘+’ (plus sign) or ‘-‘ (minus sign) - there are no spaces between values.
