Principle Of Contactless Cards; Communication; Telegram Structure - Honeywell 026380.00 Montage- Und Bedienungsanleitung

10 Connection and Operation Instructions

1. Principle of contactless cards

The inside of the card consists of an oscillator circuit and
a micro-chip containing the card´s code. The contactless
reader broadcasts a low electromagnetic field, which is in
resonance with the oscillator circuit of the card. The card
now modulates the received frequency with its own bit-
pattern, which is received and evaluated by the reader.

2. Communication

The contactless reader communicates with a PC (COM1/COM2) or another
communication device via an RS-232 interface according to point to point protocol in
accordance to DIN 66019, state: May 1976.
For more detailed information about this protocol see the separate documentation
P40118-15-000-XX.
the transmission format is UART/RS 232 C with 1 start bit, 7 data bits,
1 parity bit (even parity), 1 stop bit.
While reading a card, the reader converts the card´s content (40 Bit = 5 Bytes) to ASCII-
digits (1Byte = 2 ASCII-digits) and sends the ASCII-digits to the PC via the RS-232-
interface.

3. Telegram structure

STX, AA, BB, Data, ETX, BCC
AA: = 30H
= 31H
= 32H
= 33H
= 34H
BB: = 30H
= 31H
= 32H
= 33H
= 34H
= 35H
all other: no LED-alteration
The LEDs are contained in "BB". The state of the LED gets sent from the reader to the
PC witch each individual telegram.
Card content (10 digits) get sent from reader to PC
LEDs of reader get controlled
Keypad data get sent from reader to PC
Relay gets controlled by the PC
DIP-Switch position gets transmitted to the PC after each
alteration (test mode)
all LEDs off
yellow LED on
green LED on
yellow + green LED on
red LED on
yellow + red LED on
Contactless reader with RS-232-interface
Contactless card
data