User Guide | Intelligent Purging System (IPS 8) for Ammonia - Technical data, installation and use
20 | BC306932151284en-000201
© Danfoss | DCS (ms) | 2020.01
Modbus RTU
Table 04
Modbus RTU Registers
Good Practice
The wiring of Modbus RTU (RS485) must be carried out in accordance with the standard ANSI/TIA/EIA-485-A-1998.
Galvanic separation shall be provided for segments crossing buildings.
Common ground shall be used for all devices on the same network inclusive router, gateways etc.
All bus connections in the cables are made with twisted pair wires.
The recommended cable type for this is AWG 22/0.32 mm². If used for longer distances please use a AWG 20/0.5mm² or AWG 18/0.75mm²
cable. The cables characteristic impedance shall be between 100 – 130Ω The capacitance between conductors shall be less than 100 pf
per meter.
Note: the length of the cables influence the communication speed used. Longer cable lengths mean lower baud rate should be used.
Maximum cable length allowed is 1200m.
Use a minimum 20 cm distance between 110V/230V/400V power line cables and bus cables.
Register Parameter Name Description
User
Level
Min Value Max Value
Default
Value
Unit/
Type
Read/
Write
Modbus
Function
Code
Modbus
Data Type
Persistent
Yes/No
GENERAL > SETUP
3001 ON/OFF
0: Main switch off
1: Main switch on
2 0 1 1 Enum 1 RW 3/6 Short Yes
3002 Activate Multipurger
Switch on/off
multipurging
functionality
0: No
1: Yes, switch on
multipurging
functionality
2 0 1 1 Enum 2 RW 3/6 Short Yes
3003
Restore default
parameters
0: No
1: Yes, restore default
parameters
2 0 1 0 Enum 2 RW 3/6 Short Yes
GENERAL >
CONFIGURATION
3004 Buzzer activation time
Time in which buzzer
is on for in minutes
3 0 15 1 min RW 3/6 Short Yes
3005
Alarm relay activation
delay
Delay in which alarm
is active after relay
activated
3 0 999 0 s RW 3/6 Short Yes
3006
Alarm relay active if
unit in OFF
0: No
1: Yes
3 0 1 1 Enum 2 RW 3/6 Short Yes
GENERAL > SERIAL
SETTINGS
3007
Serial address (Modbus
and CAN)
2 1 100 1 N/A RW 3/6 Short Yes
3008
Serial baudrate
(Modbus)
TThe rate at which
information is
transferred in the
RS485 communication
channel
0: 0
1: 12
2: 24
3: 48
4: 96
5: 144
6: 192
7: 288
8: 384
2 0 8 6 Enum 3 RW 3/6 Short Yes
3009
Serial settings
(Modbus)
0: 8N1
1: 8E1
2: 8N2
2 0 2 1 Enum 4 RW 3/6 Short Yes
GENERAL >
PASSWORD
3010 Password level 1
password for user
level 1
3 0 999 100 N/A RW 3/6 Short Yes
3011 Password level 2
password for user
level 2
3 0 999 200 N/A RW 3/6 Short Yes
3012
Advanced Setting -
Password level 3
Recommend default
setting only
3 0 999 N/A N/A RW 3/6 Short Yes
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