Raymarine AIS4000 - Technical Information; Interface Circuits

Technical information
Page 83
6 Technical information
6.1 Interface circuits
6.1.1 Sensor data input port
The sensor data input port schematic is shown in Figure 31.
Figure 31 Input port schematic
A logical low input is defined as: A-B < -0.2V.
A logical high input is defined as: A-B > +0.2V.
6.1.2 Bi-directional data ports
The input circuitry of the bi-directional data ports is identical to the input
circuitry for the sensor data input ports described in the preceding section. The
output circuitry consists of a differential line driver IC (Analog Devices
ADM2587E) and is shown in Figure 32.
Oscillator Rectier
Regulator
Decode
Digital isolation Transceiver
V
ISOIN
Encode
DecodeEncode
Decode
ADM2587E
RX_A
TxD
Vcc
DE
Y
Z
A
B
RxD
RE
RX
To UART
Data input port
Isolation Barrier
RX_B
RX_COM
Encode
V
ISOOUT
DC to DC Converter
GND
1
GND
2