ACR122L – Communication Protocol
Version 1.03
www.acs.com.hk
Page 5 of 57
2.0. Features
•
Serial RS-232 Interface: Baud Rate = 115200 bps, 8-N-1
•
7 V DC adaptor for power supply
•
CCID-like frame format (Binary format)
•
Smart Card Reader:
o
Read/Write speed of up to 424 kbps
o
Built-in antenna for contactless tag access, with card reading distance of up to 50 mm
(depending on tag type)
o
Support for ISO 14443 Part 4 Type A and B cards, Mifare, FeliCa and all four types of
NFC (ISO/IEC 18092) tags
o
Built-in anti-collision feature (only one tag is accessed at any time)
o
Three ISO 7816 compliant SAM slots
•
Built-in Peripherals:
o
Two-line graphic LCD with interactive operability (i.e. scroll up and down, left and right,
etc.) and multi-language support (i.e. Chinese, English, Japanese and several European
languages)
o
Four user-controllable LEDs
o
User-controllable buzzer
•
Compliant with the following standards:
o
ISO 14443
o
CE
o
FCC
o
VCCI
o
RoHS
2.1. Serial Interface
The ACR122L is connected to a Host through the RS232C Serial Interface at 115200 bps, 8-N-1
Table 1
: PIN Configuration
2.2. LCD
A user-controllable LCD is provided.
•
2 line x 16 character, 5 x 8 dot matrix, STN yellow-green LCD type
•
Yellow-green backlight
•
6 O’clock view angle
Pin
Signal Function
1
V
CC
+7 V power supply for the reader (max. 350 mA; normal 200 mA)
2
TXD
The signal from the reader to the host.
3
RXD
The signal from the host to the reader.
4
GND
Reference voltage level for power supply
