NK Series User Guide (1.0) Operation • 5–15
Read the current status of a output
Start the sequence (5 bytes) with an upper case <R> followed by the destination and carriage return as detailed
below. Do not include the parentheses.
<R> <ddd> <CR>
Response from SCP
• If the data sting is valid, the SCP returns response (C) then (B).
• If the data string is invalid, the SCP returns response (A).
• If the data string is valid but the destination is incorrectly specified, i.e. greater than 254 (255 to 999), the SCP
returns response (A) then response (B).
NK-SCP/K2 Operation
Implementation of the NK-SCP/K2 means that NK routers can be controlled exactly as if they were a matrix
module housed within the Kondor 2 frame. Switches can be activated by Geneos control panels as well as from a
Virtual Control Panel (VCP) from the Panelworks page in the Geneos software.
When switches are activated from a control panel or VCP connected to the Geneos CPU, the SCP/K2 monitors
commands and converts them to the T-Bus protocol. If the command sent corresponds with a level that an NK
router is occupying, then that level will be switched. If there are no NK routers occupying that level, then the switch
will be performed where that level is occupied, most likely within the Kondor 2.
Switches can be activated from the NK control panel (RCP-NK1) but are not advised as they will not be reflected
within the Geneos CPU status table. If an RCP-NK1 is connected to the router (or T-Bus), any switches activated by
the panel will override the status and commands from the Geneos panels or Geneostat virtual control panels.
Video Referencing
Overview
All NK Video and Audio routers are fitted with a video switching reference input to ensure that switching occurs in
the vertical interval across all levels. Normally, the reference input signal is a color black (Black burst) composite
signal, however it may be any normal composite signal. The NK router will automatically detect the signal as being
either 625/50 (PAL) or 525/60 (NTSC) and automatically adjust the switching pulse to comply with RP 168, line 6
for PAL and line 10 for NTSC.
The NK router switches on frame boundaries. There are two 75 Ω BNC reference input BNCs on each NK router
arranged as a passive loop-through pair. Normally, a single Black Burst signal is looped through each of the routers
which are located together and a 75 Ω terminator is connected to the last BNC socket. An individual Black Burst
signal should be wired to routers which are more than a few meters apart.
If the reference signal is absent, the NK router will generate a free-running switching pulse over 40ms. The status of
the switching reference may be monitored on the router’s Device Properties page via the NK-IPS, one of three
conditions may be reported via the NK-IPS: Local, PAL reference present or NTSC reference present.
Connecting a Video Reference to NK Routers
When using a video reference with any of the NK router components, users must remember to terminate the last
video reference that is not looped with a 75 Ω BNC terminator.
When only video referencing one router, the other BNC connector of the video reference loop needs to be
terminated, as in Figure 5.2.
Response (A) <CR> <LF> <ERROR> <CR> <LF>
Response (B) <CR> <LF> <OK> <SP> <CR> <LF>
L1 L2 L3 L4 L5 L6 L7 L8
Response (C) <CR> <LF> <sss, sss, sss, sss, sss, sss, sss, sss> <CR> <LF>
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