
6 Electrical connection
67
BA6820378-03 EN
▪ You must connect the sensors via a shielded line with 3 conductors (D0,
D1, Common). The data lines (D0, D1) must be in twisted pairs. Note the
cable recommendation.
▪ Stub lines from the bus node to the respective device must be shorter
than 20 m.
▪ The CPU assembly contains a terminating resistor (120 Ω) at the COM2
interface. Install another terminating resistor (120 Ω, 0.5 W) at the other
end of the bus.
▪ The CPU assembly contains a pull-up resistor and a pull-down resistor
(each of 680 Ω in accordance with the Modbus specification). No addi-
tional pull-up/pull-down resistors are needed.
CPU-COM2
Sensor 1
Sensor x
D0 (A)
D1 (B)
Com. (C)
1
2
3
4
5
6
7
8
9
D0 (A)
D1 (B)
Com. (C)
D0 (A)
D1 (B)
Com. (C)
120 Ω
Figure 46: MR sensor bus
Содержание MESSKO MTRAB
Страница 1: ...Dehydrating breather MESSKO MTRAB Operating instructions BA6820378 03 EN Version 2 5 ...
Страница 19: ...3 Product description 19 BA6820378 03 EN 3 2 Design versions Figure 1 Design ...
Страница 82: ...8 Operation 82 BA6820378 03 EN Figure 62 Ball valve 1 Switch 2 Ball valve 3 Display 4 Ball valve control cable ...
Страница 84: ...9 Error messages and troubleshooting 84 BA6820378 03 EN Figure 63 LEDs 1 Green LED 2 Yellow LED 3 Red LED ...
Страница 102: ...11 Disposal 102 BA6820378 03 EN Observe the national disposal regulations in the country of use ...
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