Termination Resistor; Setting The Parity; Setting The Modbus Transmission Speed; Grundfos 产品的安装和操作指导中对 Cim 2Xx 的改 进进行了说明。 详细资料 - Grundfos CIM 2 series Montage- Und Betriebsanleitung

Modbus address
8
20
31
247

3.3 Termination resistor

The termination resistor is fitted on the CIM 2XX
Modbus module and has a value of 150 Ω.
The CIM 2XX has a DIP switch with two switches
(SW1 and SW2) for cutting the termination resistor in
and out. Figure 5 shows the DIP switches in cut-out
state.
SW1 SW2
Fig. 5 Cutting the termination resistor in and out
DIP switch settings
Status
Cut-in
Cut-out
Cable length
Maximum cable length
Terminated
bits/s
cable
[m/ft]
1200-9600 1200/4000
19200 1200/4000
38400 1200/4000
To ensure a stable and reliable
communication, it is important that
only the termination resistor of the first
Note
and last unit in the Modbus network is
cut in. See fig. 2.
8
SW6 SW7
0 8
1 4
1 F
F 7
SW1 SW2
ON ON
OFF OFF
ON OFF
OFF ON
Unterminated
cable
[m/ft]
1200/4000
500/1700
250/800

3.4 Setting the parity

The CIM 2XX Modbus module is default set to even
parity (1 stop bit). It is possible to change the parity.
The parity can be changed to no parity (2 stop bits).
It is not possible to set the parity to odd. See fig. 6.
SW3
Fig. 6 Parity
DIP switch settings
Parity
Even parity, 1 stop bit
No parity, 2 stop bits
3.5 Setting the Modbus transmission
speed
The transmission speed must be set correctly before
the CIM 2XX Modbus module is ready to
communicate with the Modbus network. See fig. 7.
SW4 SW5
Fig. 7 Modbus transmission speed
DIP switch settings
Transmission speed
[bits/s]
9600
19200
38400
Software-defined
When the transmission speed is set to
"software-defined", the speed can be
set to 1200, 2400 or 4800 bits/s via a
Note
Modbus register.
See the specific functional profile on
the CD-ROM supplied with the product.
SW3
OFF
ON
SW4 SW5
OFF ON
OFF OFF
ON OFF
ON ON