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© PCE Instruments
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6 RS-485 interface (optional)
The communication with the wind speed alarm controller PCE-WSAC 50 is enabled by the
MODBUS RTU protocol and the serial RS-485 port. This allows different registers containing the
measured wind speed, the wind scale and other information to be read.
6.1 Communication protocol
The registers can be read by means of the Modbus function 03 (03 hex) and written into
by the function 06 (06 hex).
Supported baud rates
1200, 2400, 4800, 9600, 14400, 19200,
38400, 56000, 57600, 115200
Data bits
8
Parity bit
None
Stop bits
1 or 2
Data type of registers
16-bit unsigned integer
6.2 Standard setting
Baud rate
9600
Parity
None
Stop bit
1
Address
123
6.3 Excerpt from register addresses
Register
address (dec)
Register
address (hex)
Description
R/W
0000
0000
Current wind speed in m/s
R
0001
0001
Current wind scale
R
0034
0022
Pre-alarm
R/W
0035
0023
Alarm
R/W
0080
0050
Modbus address
R/W
0081
0051
Baud rate (12 = 1200 baud, 24 = 2400 baud,
etc.)
R/W
0084
0054
Stop bits (1 or 2)
R/W
34


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