15
optocoupler 4 external signal input positive
IO_INPUT4
16
optocoupler 2 external signal input positive
IO_INPUT2
17
Relay 4 output port
OUT_L4
18
Relay 3 output port
OUT_L3
19
Relay 2 output port
OUT_L2
20
Relay 1 output port
OUT_L1
2.4.3 Schematic diagram of USB interface
USB interface application:
1: Application software online upgrade (as shown in figure 2-5 “USB interface")
2: USB communications, serial port and network communication all in one (as shown in figure 2-5 USB
communication interface")
Image 2-5 schematic diagram of usb communication port
2.4.4 Description of feeder line(optional)
Image 2-6 schematic diagram of feeder line
RF cable TNC connector connect with reader antenna TNC connector, RF cable SMA connector connect
with external circular polarization antennas SMA connector, cable maximum length is 5m, impedance 50
Ω
,