Cim 2Xx Modbus Module; Installation; Connecting The Modbus - Grundfos CIM 2 Series Installation And Operating Instructions Manual

2.1 CIM 2XX Modbus module

1 2 3 4
Fig. 1 CIM 2XX Modbus module
Pos. Designation
1 D1
2 D0
3 Common/GND
4 SW1/SW2
5 SW3/SW4/SW5
6 LED1
7 LED2
8 SW6
9 SW7
8
9
5 6 7
Description
Modbus terminal D1
(positive data signal)
Modbus terminal D0
(negative data signal)
Modbus terminal
Common/GND
On/off switches for
termination resistor
Switches for selection of
Modbus parity and
transmission speed
Red/green status LED for
Modbus communication
Red/green status LED for
internal communication
between the CIM 2XX and
the Grundfos product
Hex switch for setting the
Modbus address
(four most significant bits)
Hex switch for setting the
Modbus address
(four least significant bits)

3. Installation

Warning
The CIM 2XX must only be connected to
SELV or SELV-E circuits.

3.1 Connecting the Modbus

A screened, twisted-pair cable must be used. The
cable screen must be connected to protective earth
at both ends.
Recommended connection
Colour
Modbus terminal
code
D1 Yellow
D0 Brown
Common/GND Grey
Fitting the cable
Procedure:
See fig. 3.
1. Connect the yellow conductor(s) to terminal D1
(pos. 1).
2. Connect the brown conductor(s) to terminal D0
(pos. 2).
3. Connect the grey conductor(s) to terminal
Common/GND (pos. 3).
4. Connect the cable screens to earth via the earth
clamp (pos. 4).
It is important to connect the screen to
earth through the earth clamp and to
Note
connect the screen to earth in all units
connected to the bus line.
Maximum cable length, see section
resistor.
Master
Slave
Slave
Slave
LT = Line Termination
(termination resistor)
Slave
Fig. 2 Example of Modbus network with
termination
* Hardware unit enabling connection to the Modbus
network.
Data signal
Positive
Negative
Common/GND
3.3 Termination
*
Slave
3