JRC JCY-1850 - 2.2.7 NSK interface; 2.2.8 Radar switching recording function

2. Specification
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2.2.7 NSK interface
(1) Function: Records gyro compass signal (Synchro / Step) and/or
Ship’s speed log signal as IEC61162-1 sentence formatter
(2) Performance:
a) Signal input: Synchro signal for Gyro compass
Ratio: 360X, 180X, 90X, 36X, 1X
Primary voltage: AC50 – 115V, 50/60Hz
Secondary voltage: AC20 – 90V, 50/60Hz
Step signal for Gyro compass
Ratio: 360X, 180X, 90X, 36X, 1X
Voltage: DC24V / 35V / 50V / 70V
Pulse signal for speed log
Pulse number: 200P / 400P / 100P / 160P (Per NM)
Interface: Opto-Isolation / dry contact signal
b) Recoding data: Data type: IEC61162-1
Heading Sentence formatter: HDT
Sip speed Sentence formatter: VBW
2.2.8 Radar switching recording function
Specification of radar switching recording function when connecting two radars is as
follows:
(1) Function:
a) The radar screen in operation is automatically identified and recorded.
Automatic identification can be performed by monitoring the operation conditions
of the scanners, which can be judged by the original sentences conforming to
IEC61162 outputted from JRC radars.
b）Switching recording function is only available when JRC radars are connected.
The radars corresponding to this switching recording function are the current
models or newer (JMA-5300, JMA-9900, JMA-900M). The older models do not
correspond.
(2) Performance:
Radar switching recording function supports for connecting two non-JRC radars
(refer to 2 and 3 below). However, for non-JRC radars, we do not recommend
using switching recording function because automatic identification of the
working radar is not functional under the normal operation conditions.
For using switching recording function in the case of non-JRC radars, read the
following specification for proper recording of the working radar images.
a) Current JRC radars (JMA-5300, JMA-9900, JMA-900M)
Operation conditions of scanners are monitored by the sentences conforming
to IEC61162 outputted from X-band radars. When the scanner of X-band
radar is in operation, the radar image connecting to CH1 will be recorded.
When the scanner of X-band radar is not in operation, the radar image
connecting to CH2 will be recorded.