46
SensyMaster FMT230, FMT250
THERMAL MASS FLOWMETER | OI/FMT230/250-EN REV. C
… 7 Electrical connections
… Electrical data for inputs and outputs
Binary output (passive)
Terminals
41 / 42, 51 / 52
Output ‘closed’
0 V
≤
U
CEL
≤
3 V
2 mA
≤
I
CEL
≤
30 mA
Output ‘open’
16 V
≤
U
CEH
≤
30 V DC
0 mA
≤
I
CEH
≤
0.2 mA
Switching function
Configurable
Parameter range - Output
on page 81
Note
• Digital output 51 / 52
cannot
be configured as a frequency
output.
• Terminals 42 / 52 have the same potential. Digital outputs
41 / 42 and 51 / 52 are not electrically isolated from each
other.
• If you are using a mechanical counter, we recommend setting
a pulse width of
≥
30 ms and a maximum frequency of
f
max
≤
3 kHz.
Modbus® communication
Note
The Modbus® protocol is an unsecured protocol, as such the
intended application should be assessed to ensure that these
protocols are suitable before implementation.
Modbus is an open standard owned and administrated by an
independent group of device manufacturers styled the Modbus
Organization (
www.modbus.org
).
Using the Modbus protocol allows devices made by different
manufacturers to exchange information via the same
communication bus, without the need for any special interface
devices to be used.
Modbus protocol
Terminals V1
/
V2
Configuration
Via the Modbus interface or via the local operating
interface in connection with Asset Vision Basic
(DAT200) and a corresponding Device Type Manager
(DTM)
Transmission
Modbus RTU - RS485 serial connection
Baud rate
2400, 4800, 9600, 19200, 38400, 56000, 57600,
115200 baud
Factory setting: 9600 baud
Parity None,
even,
odd
Factory setting: odd
Stop bit
One, two
Factory setting: One
IEEE format
Little endian, big endian
Factory setting: Little endian
Typical response time
< 100 ms
Response delay time
0 to 200 milliseconds
Factory setting: 10 milliseconds
