Diagnostics; Damping; Calibration; External Alarm Setup - Simrad NSS evo2 series Installation Manual

and Alarms can be grouped either in 'Simrad' group, or groups '1' through to '6'. If any of the
settings require discrete control, set it to 'none'.

Diagnostics

The NMEA 2000 tab on the diagnostics page can provide information useful for identifying an
issue with the network.
Bus state simply indicates whether the bus is powered, but not necessarily connected to any
data sources. However if bus shows as 'off' , but power is present along with an increasing error
count, it is possible that termination or cable topology is incorrect.
Rx Overflows: The CAN driver got too many messages for its buffer before the application
could read them.
Rx Overruns: The CAN hardware got too many messages for its buffer before the CAN driver
could read them.
Rx/Tx Errors: These two numbers increase when there are error messages, and decrease
when messages are received successfully. These (unlike the other values) are not a cumulative
count. Under normal operation these should be at 0. Values around 96 upwards indicate
a heavily error prone network. If these numbers go too high for a given device, it will
automatically drop off the bus.
Fast Packet Errors: Cumulative counter of any fast packet error. This could be a missed
frame, or a frame out of sequence etc. NMEA 2000 PGNs are made of up to 32 frames. The
entire message will be discarded when a frame is missed.
¼ Note:
Rx and Tx Errors often indicate an issue with the physical network, which may be
resolved by correcting termination, reducing backbone or drop lengths, or reducing the
number of network nodes (devices).

Damping

If data appears erratic or too sensitive, damping may be applied to make the information
appear more stable. With damping set at MIN, the data is presented in raw form with no
damping applied. This is available for heading, course over ground, speed over ground,
apparent wind, true wind, boat speed, depth, and tide sourced from NMEA 2000.

Calibration

An offset (positive or negative) can be applied to correct inaccuracies in boat speed, sea
temp, air temp, barometric pressure, and depth sourced from NMEA 2000.

External Alarm Setup

The 'Siren Enabled' option must be set in order for the unit to drive the buzzer when an alarm
condition arises. Its setting also determines the operation of the external alarm output.

Echosounder setup

Select echosounder source
If only one sonar source is present in the network, selection is not required as it should be
picked up automatically. However when more than one source exists (eg a BSM-2 or other
display with internal sonar), select the desired source in the Echo Settings.
Software setup | NSS evo2 Installation Manual
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