266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A 33
Note – Connection of a Pt100 temperature sensor
For the purpose of simulation, a 178 έ resistor
[206 °C (402.8 °F)] with 2 jumpers has been installed between
the terminals for the Pt100 connection.
This resistor (including the jumpers in the case of 4-wire
connections) must be removed before connecting the Pt100
If a Pt100 is not connected, the resistor must not be removed.
Electrical data for inputs and outputs
Devices with Modbus communication
Terminals PWR + / PWR Æ
Supply voltage 10.5 to 30 V DC
Note
For current draw requirements see Figure 26.
For power consumption based on specific supply voltages
see Figure 27.
M11197
12
10
8
6
4
2
0
11
13
15
17
19
21
23 25
27
29
I [mA]
U [V]
Figure 26: Supply current chart
M11198
97
96
95
94
93
92
91
10
12
14
16
18
20
22 24 26
P [mW]
U [V]
Figure 27: Power consumption chart
Modbus communication
Note
The Modbus protocol are not secure, as such the intended
application should be assessed to ensure that these protocols
are suitable before implementation.
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.
Up to 32 devices can be connected on one Modbus line. The
Modbus network can be expanded using repeaters.
120 Ω
120 Ω
D
R
D
R
D
R
A
B
GND
G11603
1
2
3
4
2
1 Modbus master
2 Terminating resistor
3 Modbus slave 1
4 Modbus slave n to 32
Figure 28: Modbus network (example)
Modbus® interface
Configuration
(HART-RS485)
Via an RS485 interface in connection with Asset
Vision Basic (DAT200) a HART communication
DTM and a corresponding Device Type Manager
(DTM)
Operating
(Modbus communication)
Modbus RTU – 2-wire half-duplex RS485 serial
connection
Baud rate 1200, 2400, 4800, 9600, 19200, 38400, 57600,
115200 bps.
Factory setting: 9600 bps
Parity None, even, odd
Factory setting: none
Typical response time < 100 milliseconds
Response delay time 0 to 200 ms
Factory setting: 50 ms
Device address 1 to 247
Factory setting: 247
Register address offset One base
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