HID Global Corporation 5553 Manuale Utente
1508-USM-00-0-04
HF Multi ISO RFID Reader User Manual, Firmware V1.4
Page 14 of 144
August 2010
© 2005-2010 HID Global Corporation. All rights reserved.
1.3 Jumper 2 Details
Table 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
Table 4 - Electrical characteristics of J2 PINs
PIN
PIN No.
Min
Typ.
Max.
Description
RX 11
USART-TTL
25 mA
Rx to PC
To RS232, RS485 or RS422 device
driver
To RS232, RS485 or RS422 device
driver
TX 12
USART-TTL
1
25 mA
Tx to PC
To RS232, RS485 or RS422 device
driver
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
Logic High = Reader to Host
Logic Low = Host to Reader
USER 14
TTL
25 mA
User Port
MCLR 15
TTL
Master clear
Leave unconnected
Leave unconnected
EN 16
ST
25 mA
Enable reader
logic low will disable the reader
Open or logic high
logic low will disable the reader
Open or logic high
VDD
min
@ 25mA
VDD
typ
@ 11mA
VDD
max
@ 0 mA
LED red
Output Voltage
Output Voltage
LEDr 17
11mA 25mA
External
Resistor
min. 200
1
Universal Synchronous Asynchronous Receiver Transmitter
3
TTL buffer output / input. If user port is used as an output, a 1k
Ω (current limiting) series resistor
has to be integrated into the connecting wire, otherwise the reader device can be damaged.
4
Voltage spikes below GND at the MCLR/VDD pin, including currents greater than 80mA, may
cause latch-up. Thus, a series resistor of 50-100
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