User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 138
16.1.3.4 Electrical characteristics of J3 PINs in RS485 Configuration
PIN PIN No. Min Typ. Max. Description
RFU 1 Do not connect
4.5V 5V 5.5V Supply Voltage
+5V 2
150mA 250mA Supply Current (without
SAM)
GND 3 GND Ground for Power
Supply and Interface
RX/RXA 4 -7V +12V RX, connect to PIN 5
TX/TXA 5 -7V +12V TX
RXB 6 -7V +12V RX, connect to PIN 7
TXB 7 -7V +12V TX
Description PIN No.
Conditions Min Typ. Max.
Differential Output
Voltage
4/6 Unloaded GND V
CC
Differential Output
Voltage
5/7 Loaded:
R
L
=270Ω
1.5V V
CC
1
20
1
7
J3
+5V
Ground
RXA / TXA
RXB / TXB
RS485 Configuration
Figure 16-5: Pin out of jumper 3 in RS232 Configuration