Dorset identification b.v. Reserves the rights to change
specifications without prior notice
4
2.3 PC
The PC is used for making all the decoder settings. The PC can communicate with the decoders via its standard
internal RS232 comport(s). Another option is using RS485 communication, which allows the decoders to be put
in a network. Only connect one type of communication.
2.3.1 RS232 communication
The direct RS232 connection is the easiest way to connect a decoder to the PC. It is especially used for access
control systems with a low number of readers (1..4). The RS232 communication can only be used if a decoder
is situated close to the PC (up to 14 meters / 46ft).
Figure 1: RS232 communication.
2.3.2 RS485 communication
The 2-wire RS485 network connection is used when larger numbers of decoders are used or when the distance
between decoder and PC is too far for a direct RS232 connection. A RS485 network connection requires a
RS485 comport-card in the PC, which is normally not present in a standard PC.
An external RS232 to RS485 converter can also be used.
Figure 2: RS485 communication using internal RS485 port card.
Figure 3: RS485 communication via RS232/RS485 converter.
PC
Decoder
1
Decoder
2
Decoder
3
PC
Decoder
1
Decoder
3
Decoder
2
Up to 31
units
RS232/RS485
converter
Decoder
1
Decoder
3
Decoder
2
Up to 31
units
PC
