DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
60
Danfoss Electronics spa
Air Handling seq.
- user manual
16| Modbus Communication
The communication protocol supported by the RS485 network is the Modbus RTU slave
MODBUS COMMUNICATION
GEN
General
Min
Max
Default
U.M.
Text value
SEr
Modbus
SEr
Modbus address
1
254
1
bAU
Baudrate
1
9
192
;0;12;24;48;96;144;192;288;384
COM
Settings
1
3
8N1
;8N1;8E1;8N2
Tab 41_ [Modbus Communication - Modbus Communication]
The following communications settings can be set:
SEr - Serial address (Modbus and CAN)
Serial node address setting, valid both for the Modbus and CAN networks. Each node on the network must have an
unequivocal address
bAU – Serial Baudrate (Modbus)
bAU=0.
communication disabled
bAU=12.
baudrate=1200 baud
bAU=24.
baudrate=2400 baud
bAU=48.
baudrate=4800 baud
bAU=96.
baudrate=9600 baud
bAU=144.
baudrate=1440 baud
bAU=192.
baudrate=19200 baud (default value)
bAU=288.
baudrate=28800 baud
bAU=384.
baudrate=38400 baud
COM – Serial settings
COM=8N1.
8 data bits, no parity, 1 stop bit
COM=8E1.
8 data bits, parity even, 1 stop bit
COM=8N2.
8 data bits, no parity, 2 stop bits
The exported variables are of the “Holding Register” or “Coil” type.
16.1| Table of exported variables
TABLE OF EXPORTED VARIABILES 1
Code
Description
Notes
R/W
Coil Address
Digital input
Not Used
1
ASF
SupFan Alarm
SupFan Alarm
R
2
SSS
SupFan SafeSW
Supply Fan safety switch (port open)
R
3
ASR
RetFan Alarm
Return Fan alarm
R
4
CSR
MixDamp Closed
Mixing Damper closed
R
5
SSR
RetFan SafeSW
Return Fan safety switch
R
6
CSE
ExtDamp Closed
External Damper closed
R
7
ONF
ON/OFF
ON/OFF
R
8
AFI
Fire Alarm
Fire alarm
R
9
AAI
Freeze Alarm
Freeze alarm
R
10
CH
Summer/Winter
Summer/Winter selection
R
11
SFW
Supply Flow
Supply flow alarm
R
12
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