Instructions

Contactless Card Read/Write Module（QM-201C-HF）User’s
Manual
☞Communication Protocol:
1. UART: Baud Rate 19200bps。
2. IIC：Max rate 400Kbps。
☞Auto request card: When the card put into antenna, the pin “CARDIN” will be
low.
☞Power supply :+4.5~+5.5V.
☞Read Card distance 5~10cm.（Depend on the antenna）
☞You can get C51 source code example with theh module.
4 Function specification
4.1 Pin Function
Pic 1
Pin function [Table 1]:
Pin
1
2
Function
VCC
Description
+5V VCC
GND
GND
3
4
RXD/SCL UART RXD/ IIC SCL
TXD/SDA UART TXD/ IIC SDA
Card In/Out Indicate(Only when auto request)
0:Card In. 1:Card Out.
CommunicationProtocolSelector( 0: IIC, 1:
UART )
Not Use
Not Use
5
6
CARDIN
PORTSEL
7
8
NC
NC
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