ADVANSEA MULTI S400 Manuel Utilisateur page 17

2. 6. Network operation (Bus AS-1)
The AS-1 bus is used to connect products in the advanSea family via a rapid and reliable
exchange protocol. Only the bus wires need to be connected. No start-up settings are required.
The communication protocol allows for multiple data exchange at previously defined
transmission speeds.
Thus, it is possible:
to exchange several similar measurements on the same bus, for example: several
speedometer sources.
to change the units, the alarm threshold values or to calibrate from a single
instrument.
to activate or deactivate alarms from a single instrument.
The protocol allows exchange of similar data from different sources (direct measurement from
the sensor, or from the bus or via NMEA).
2.6.1. Displaying multiple data
In order to display multiple data, a repeater instrument (without a sensor) should be
differentiated from a measurement instrument (with a sensor or receiving NMEA data).
A repeater instrument can display maximum 2 multiple data available on the bus (for example:
port speed and starboard speed). If there are more than 2 multiple data present on the bus (for
example 3 speed sensors), the repeater will only read the information from the 2 measurement
instruments with the lowest serial numbers.
A measurement instrument (with a sensor or receiving NMEA data) will only display the data
from its own sensor or from the NMEA source received, even if other similar data are available
on the bus.
2.6.2. Remote access
A repeater instrument (without a sensor) can read and write, via AS-1 bus, all the calibration
parameters or the alarm thresholds from the same type of measuring instrument. Thus, it is
possible to calibrate the speed from the MULTI display connected to the bus.
System limitation:
For complex installations, with several similar measurement instruments, it is impossible to
calibrate alarms from a repeater instrument. In this case, these settings can only be adjusted
from the measurement unit (display to which the sensor is connected).
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Installation and Operation Manual S400 series
17