User's Manual Part 1
13,56 MHz Multitag Reader Module, Version 0.9v
ACG Identification Technologies AT Page 42
5.3.21 Read/Write User Port
This command will set or read the state of the USER port (pin 14) of the OEM reader
device. The port can be set either as output or as input.
5.3.21.1 Command
Command Data
‘pr’ none
‘pw’ State of user port (1 Byte)
5.3.21.2 Answer
Answer Description
data State of user port (1 Byte)
5.3.21.3 Read port
The port read command returns the actually state of the USER port.
Port state Description
00 USER port is low
01 USER port is high
Figure 5-27: Read USER port return values
5.3.21.4 Write port
Port state Description
00 Sets USER port to low
01 Sets USER port to high
Figure 5-28: Write User port settings
5.3.21.5 Remarks
If user port is used as an output a 1kΩ resistor has to be integrated into the wire.
Otherwise the reader device may cause damage.
5.3.21.6 Example
Command Description
Pr 00
user port is logic low.
pw01 01
Sets USER port state to high