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3.5 Sensor Interface Definitions
All interface ports of the NAUTICAST™ comply with IEC-61162-1 / -2 and NMEA-0183 HS
3.0 specifications (aligned to RS422 parameters).
3.5.1 Talker drive circuits
The maximum output current is I
= 50mA on each port. The drive circuit meets the
max
requirements of ITU-T V.11.
3.5.2 Listener Receiver Circuits
Multiple listeners may be connected to a single talker. Optional termination resistors
(120Ohm) for the input lines are provided in the connection box. The input terminals A, B and
C are electrically isolated from the remaining electronics of the listening device.
The input impedance is 30kOhm between A and B lines, disregarding the connection of
termination resistors. The minimum input voltage is ±0,3V.
The listener's receiver circuit complies with ITU-T V.11.
3.5.3 Electrical isolation
There are no direct electrical connections between the signal lines A and B.
The signal ground C must not be connected to the ship main ground or power line!
This isolation is in accordance with IEC 60945.
3.5.4 Maximum voltage on the bus
The maximum applied voltage between signal lines A and B and between either line and
ground C is in accordance with ITU-T V.11. For protection against incorrect wiring and for
unintended connection to older TALKER models, all receiver circuit devices are capable of
withstanding 15 V between both lines and signal ground for an indefinite period.
3.5.5
Data transmission
Data is transmitted in serial asynchronous form in accordance with IEC 61162-1. The first bit
is a start bit, and is followed by data bits, whereby the least significant bit is first.
The following parameters are used:
– Baud rate 38 400 (bits/s) 9600 (bits/s) 4 800 (bits/s)
– Data bits 8 (D7 = 0), parity none
– Stop bits 1.
16
Y1-03-0204 Rev. L
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