4
© PORT Technology by Schindler Ltd - Oct 20, 2017
2 General board implementation
Block schematic
Functionality
The main function of the PCR-TWN4 board is a RFID reader to be integrated into Schindler’s
PORT1 and PORT4 devices. The communication between the PCR-TWN4 and the host is
made through the USB.
USB and Power supply
The main board power supply is
U = 5 V
DC
± 5% Imax = 500 mA
from the Host The USB
communication is 2.0 Full-Speed (12Mbps). USB from the host is connected to the TWN4
board.
Connector:
SMD 4 poles JST male conn., right angle, 2 mm, Id. Nr. 432841
Silkscreen:
USB
pin signal
name
max.
voltage
Tol.
max.
current
description
1
VCC1
5 VDC
±5%
500 mA
power
2
USB_DM
5 VDC
±5%
50 mA
USB data
3
USB_DP
5 VDC
±5%
50 mA
4
M0
0 VDC
-
-
ground
USB
Wiegand
output
IOs
K-LC1a
radar
interface
JRC
radar
interface
PCR-TWN4
TWN4 module
4 RGB LEDs
SAM
socket
(optional)
HF antenna
LF antenna
(optional)
