90
A.1.2
Bidirectional Data Ports
The schematic of bidirectional data port is shown in Figure A2. The schematics includes an
isolated full duplex RS-485 transceiver IC (Texas Instrument ISO3080) which is used as the main
component to handle both data input and output from external data source. The transceiver IC is
isolated from external input. To avoid signal reflection, the transceiver IC has an optional built-in
120Ω loop termination, which is selectable by the dip-switch on the junction box and the switch
should be set to on position when connecting external data source with long cable. All bidirectional
data ports are isolated from one another and are also isolated from internal power supply. The
transceiver internal power supply is fully isolated from the external power supply.
3V3
V5T
3V3
Cable
120
RX_A
TGND
Junction Box
Data
Input
RX_B
TX_B
TX_A
TGND
Data
Output
System Ground
Rx
Tx
To/From
System
Isolated
Isolated Ground
10
10
100K
100K
Main Unit
10K
DE
RX_A
RX_B
TX_B
TX_A
ISO3080
TGND
TGND
TGND
Figure A2
Schematic of bidirectional data port.
The output driver capability of bidirectional data port can provide a maximum of 60mA, and the
minimum differential output swing under 100 Ω load can be 2.3V.
A.1.3
A and B Signal Lines
Refer to sections A.1.1 and A.1.2.
A.1.4
Output Driver
The output driver capability of bi-direction data port can provide maximum 60mA, and the
minimum differential output swing under 100 ohm load can be 2.3V.
A.1.5
Input Load
Refer to sections A.1.1 and A.1.2.
A.1.6 Hardware Input/Output Circuit
Refer to sections A.1.1 and A.1.2.
Summary of Contents for 21-100-001A
Page 1: ......
Page 2: ...2 ...
Page 3: ...3 Smartfind M5 Class A Inland AIS Installation and Maintenance Manual ...
Page 12: ...12 2 3 Interconnection Diagram Figure 1 Interconnection Diagram ...
Page 81: ...81 6 MECHANICAL DIMENSIONS 6 1 Smartfind M5 Transponder Main Unit Front size mm Side size mm ...
Page 82: ...82 Back size mm Bottom size mm ...
Page 83: ...83 6 2 Junction Box 6 3 Extension Cable 6 4 Mounting Template not to scale 85 mm 55 mm 165 mm ...
Page 84: ...84 6 5 GPS Antenna 6 6 Pilot Plug 2 m 60 mm 40 mm 60 mm 80 mm 103 92 mm ...
Page 112: ...112 Note ...
Page 113: ...113 21 135 001N Issue 15 ...
Page 114: ......