Cim 200 Modbus Rtu Setup; Setting The Modbus Transmission Speed - Grundfos CIU 202 Functional Profile And User Manual

5. CIM 200 Modbus RTU setup

1 2 3 4
CIM 200 Modbus module
Fig. 4
Pos. Designation
1 D1
2 D0
3 Common/GND
4 SW1/SW2
5 SW3/SW4/SW5
6 LED1
7 LED2
8 SW6
9 SW7
Use a screened, twisted-pair cable. Connect the cable screen to
protective earth at both ends.
Recommended connection
Modbus terminal Colour code
D1-TXD1 Yellow
D0-TXD0 Brown
Common/GND Grey
8
8
9
5 6 7
Description
Modbus terminal D1 (positive
data signal)
Modbus terminal D0 (negative
data signal)
Modbus terminal, Common and
GND
On and off switches for
termination resistor
Switches for selection of Modbus
parity and transmission speed
Red and green status LED for
Modbus communication
Red and green status LED for
internal communication between
CIM 200 and the CIU 202 unit.
Hexadecimal rotary switch for
setting the Modbus address (four
most significant bits)
Hexadecimal rotary switch for
setting the Modbus address (four
least significant bits)
Data signal
Positive
Negative
Common/GND

5.1 Setting the Modbus transmission speed

Set the transmission speed correctly before the CIM 200 Modbus
module is ready to communicate with the Modbus network. Use
DIP switches SW4 and SW5to set the transmission speed. See
fig. 5.
SW4 SW5
Modbus transmission speed
Fig. 5
DIP switch settings
Available transmission speeds in bits/s: 1200, 2400, 4800, 9600,
19200 and 38400.
The first three transmission speeds are only available via
software settings, whereas the last three are available via DIP
switches.
Transmission speed [bits/s]
9600
19200
38400
Software-defined
Default transmission speed is 19200 bits per second, as per the
Modbus RTU standard.
Software-defined
When SW4 and SW5 are set to "software-defined", writing a
value to the holding register at address 00004 sets a new
transmission speed.
Use the following values for software-defined transmission
speeds:
Software-defined transmission
speed
1200 bits/s
2400 bits/s
4800 bits/s
9600 bits/s
19200 bits/s
38400 bits/s
This value is set to 1200 bits/s as default.
The communication interface does not support transmission
speeds above 38400 bits/s.
The software-defined transmission speed value is stored in the
communication interface and remains after a power-off.
When software-defined transmission speed is
enabled (ON), software-defined parity, stop bits and
address setting are also enabled.
SW4 SW5
OFF ON
OFF OFF
ON OFF
ON ON
Value to set in register
00004
0
1
2
3
4
5