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Chapter: 13. Appendix 4. Non wheelmark approved S version
13. Appendix 4. Non wheelmark approved S version
S-version of operator unit
The standard operator unit is a wheelmark approved navigational speed log.
Some customers needs blanking of transmission signals. Use of this is not permitted in Wheelmark products.
An operator unit with “special” non-wheelmark software is available. This unit has a dierent part number
and is not wheelmarked.
Control input – PULSE2/Pulse Ref on the terminals.
Max response latency 175us. The 2-byte command needs to be sent from the display
to the transceiver. The baud rate is 115200. Interrupt latency is approximately 3us.
Softkey BLANKING is implemented at Screen status, menu 3, which selects the polarity of the blank input
signal and mode of operation (TX blank enable/disable).
If BLANKING is set to “high”, the high level on the input will silent the transceiver. Alternatively, the low
level on the input will stop transmission if the setting is “low”.
When in TX silent mode, the label “BLANK” is blinking, indicating the silent status.
The product name is changed to DL850S on the status screen (upper line).
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