Function description
Operating Manual PITreader, PITreader Firmware V1.5.x
1004806-EN-08
| 30
} Holding Register (Word/16 Bits)
Modbus Client -> PITreader, register access read (with FC03) and write (with FC06 or
FC16)
Address Content
4x6001 Overwrite colour (PITreader LED access)
4x6002 Overwrite flash mode (PITreader LED access)
4x6003 Activate (=1) or deactivate (=0) overwrite
INFORMATION
When reading data areas that contain no data, "0" is returned.
5.9.3.1 Data transfer limits
This table contains the maximum data lengths supported per telegram:
Data transfer Max. data length per tele-
gram
Read data (Bit) FC 02 (Read Discrete In-
puts)
1 … 2000
Read data (Word) FC 03 (Read Holding Re-
gisters)
1 … 125
FC 04 (Read Input Register)
Write data (Word) FC 06 (Write Single Re-
gister)
1 Word
FC 16 (Write Multiple Re-
gisters)
1 … 123 Words
5.10 HTTP(S) connection
A connection to a configuration computer can be established via the Ethernet interface. The
PITreader can be configured via a web application and it is possible to read and write
transponder keys (see also chapters entitled Configuration [ 35] and Firmware
update [ 45]).
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