Parker CDAS HL 050 - Page 33

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Medium Flow Compressed Air Dryers - IOMI.
MODBUS connectivity
e CDAS HL / OFAS HL / FBP HL dryer controller includes an RS485 port for MODBUS communication with a remote system using
the MODBUS RTU protocol. All connections should be made to the 3 terminal block connections as shown below.
e cable screen should be terminated at the terminal marked 0V. It is suggested that only the controller end of the screen is
connected to earth.
Default MODBUS Settings
Each unit (master & slaves) on the MODBUS network must have matching communication settings and a unique unit identication
(ID). e default settings for the CDAS HL / OFAS HL / FBP HL controller are shown below.
e parameters for baud rate, data bits, parity, stop bits and unit ID can all be changed by a trained service engineer using the Parker
ADS service software.
Recommended Cable Size / Length
TWISTED PAIR SCREENED CABLE
RECOMMENDED CABLE SIZE
MAX RECOMMENDED CABLE
LENGTH
0.5mm
2
- 0.75mm
2
500m [1650 ft]
0.75mm
2
- 1.0mm
2
1000m [3300 ft]
TWISTED PAIR SCREENED CABLE RECOMMENDED CABLE SIZE
Baud Rate 19200
Number of Data Bits 8
Parity Even
Number of Stop Bits 1
Modbus Unit ID (Node) 55
• When connected, the MODBUS icon will be shown on the display
• is also includes the MODBUS Unit ID (Node) number (default ID of 55 shown)