Leica MX535 manual Dgps Dgnss Channel, Sensor Interface Definitions, Talker drive circuits

MX535 UAIS Transponder Unit

Technical & Installation Manual

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3.3.2.5DGPS – DGNSS Channel 9

Field / Protocol information:

All fields are provided for further information; please refer to ITU-R M.823-2 / RTCM SC 104 for detailed field information.

3.3.2.6ALARM CIRCUIT

The AIS requires that an alarm output (relay) must be connected to an audible alarm device (MX420/AIS or MKD CDU) or the ship’s alarm system, if available.

3.4 Sensor Interface Definitions

All interface ports of MX535 Transponder comply with IEC-61162-1 / -2 and NMEA-0183 HS 3.0 specifications (aligned to RS422 parameters).

Talker drive circuits

The maximum output current is Imax = 50mA on each port. The drive circuit meets the requirements of ITU-T V.11.

Listener Receiver Circuits

Multiple listeners may be connected to a single talker. Optional termination resistors (120Ohm) for the input lines are provided in the JB-50 Junction Box (optional). 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.

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.

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.

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 4800 (bits/s)

•Data bits 8 (D7 = 0), parity none

•Stop bits 1.

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