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NK-3RD User Guide (v04) Operating the NK-3RD • 23
Operating the NK-3RD
Third-Party Device Configuration
The third-party device will need to be configured to output SW-P-08, SW-P-02, ESswitch, or GVG Native
commands on the RS-422 serial port. This is device specific, and users should consult the documentation that
comes with the third party-device.
For correct operation, the following conditions need to be met:
• The third-party device needs to be configured to send SW-P-08, SW-P-02, ESswitch, or GVG Native commands
on the RS-422 port to which the NK-3RD is connected.
• The NK-3RD external port uses 38.4k or 19.2k baud data rate, with 1 stop bit and ODD parity.
This may require adjusting the parity setting at the other end of the serial line (e.g. on the automation server,
etc.). If the controller does not support configurable serial parity settings, contact Ross Video Tech Support for
additional support/help.
• The third-party device needs to be configured to use the same matrix number as the NK-3RD. The NK-3RD is by
default set to 0. This is the lowest possible matrix number. If the third-party device gives a 0 (zero) option, then it
should be selected.
• The third-party device needs to be configured to output the same level number as the NK Series router level that
it is controlling. For example, an NK-3G router will use level 1.
• The third party device needs to have an output range set that matches the router level being controlled. For
example, an NK-3G144 router uses outputs 1 to 144 by default.
• The third party device may need to have labels configured. If so, it will also need to be told to use its internal
labels rather than requesting them from the SW-P-08, SW-P-02, ESswitch, or GVG Native protocol. The
NK-3RD does not send label information.
Status Request
When a status request is received by the NK-3RD, it responds with the selected destination current status. The
format of the response is protocol dependent.
This operation does not require any communication with the NK system, as the NK-3RD keeps a complete copy of
the NK system status. This cache is updated by the NK system upon status change.
Switch Request
When a Switch or Take request is received by the NK-3RD, it sends a switch command to the NK system.
A switch response from the NK router will cause the NK-3RD internal cache to be updated. Any third-party
communications upon this response is protocol dependent. It is the responsibility of the third-party device to
manage retries.
Device Logging
The NK-3RD may log the communications between a third party device and the NK system. This is useful for
debugging communication errors. As the NK-3RD has limited internal capacity (1000 entries), two logging
functions are provided:
• Start-up — Logs the large amount of communications at device start-up.
• Rolling — Logs the on going communications. The log will 'roll over' to the start once 1000 entries is reached.
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It is recommended for device performance that logging not be enabled for normal operation.