User's Manual Part 1

13,56 MHz Multitag Reader Module, Version 0.9v
ACG Identification Technologies AT Page 49
8.1.2 Supply voltage 12V
Following components have to be added:
Component Description
U1 Voltage Regulator 7805
D1 TMM BAT42
C4 330 nF, 50V, Shape 1206
C5 100 nF, 50V, Shape 0805
Figure 8-2: 12 V components
8.1.3 RS485/422
Using the RS485 bus following changes are necessary.
Remove following items:
Component Description
U2 Sipex SP202EEN
Figure 8-3: RS232 device driver
Add following items:
Component Description
U3 Sipex SP485REN
U4 Sipex SP485REN
Figure 8-4: RS485 device driver
8.1.3.1 RS422
RS422 is a four-wire communication. The reader module does not support full duplex
at the same time.
8.1.3.2 RS485
Connect following pins of J3:
Pin Description
4, 5 RXA, TXA, used as line A
6, 7 RXB, TXB, used as line B
Figure 8-5: Pin connection of RS485