SRT AIS, Installation And Operation Manual

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Technical Information
Page 61
6 Technical Information
6.1 Interface Circuits
6.1.1 Sensor Data Input Port
The sensor data input port schematic is shown in Figure 27.
Figure 27 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 circuit-
ry for the sensor data input ports described in the preceding section. The out-
put circuitry consists of a differential line driver IC (Analog Devices
ADM2587E) and is shown in Figure 28.
Oscillator Rectifier
Regulator
Decode
Digital isolation Transceiver
VISOIN
Encode
Decode Encode
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
VISOOUT
DC to DC Converter
GND1 GND2