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HF Multi ISO RFID Reader
1508-USM-00-0-02
User Manual, Firmware V1.2
7.1.3
Pin out – Jumper 2
PIN
PIN No.
Description
VDD
20
Supply Voltage
GND
19
Ground
LEDg
18
LED green (reading LED)
LEDr
17
LED red
EN
16
Enable reader, open or logic high
MCLR
15
Master clear
USER
14
User Port
DIR
13
Direction of RS 485
TX
12
TX to PC
RX
11
RX from PC
7.1.4
Electrical characteristics of J2 PINs
Table 2 Electrical characteristics of pins
Min
Typ.
Max.
Description
PIN
PIN No.
RX
11
USART-TTL 1
25 mA
RX to PC
To RS232, RS485 or RS422 device
driver
TX
12
USART-TTL1
25 mA
TX to PC
To RS232, RS485 or RS422 device
driver
DIR
13
TTL
25 mA
Direction of RS 485
Logic High = Reader to Host
Logic Low = Host to Reader
USER
14
TTL 3
25 mA
User Port
MCLR
15
TTL 4
EN
16
ST 5
Master clear
Leave unconnected.
Low will reset the register and the key
management to default values.
25 mA
1
Universal Synchronous Asynchronous Receiver Transmitter
3
TTL buffer output / input
Enable reader
logic low will disable the reader
Open or logic high
4
Voltage spikes below GND at the MCLR/VDD pin, including currents greater than 80mA, may cause
latch-up. Thus, a series resistor of 50-100Ω should be used when applying a "low" level to the MCLR/VDD,
rather than pulling this pin directly to GND.
5
Schmitt trigger buffer input
November 4, 2008
Page 33 of 125
© 2008 HID Global Corporation. All rights reserved.