JRC JCY-1800 Installation Manual page 29

1.10.3.7. NSK interface (VDR: option, S-VDR: standard)
(1) Function:
(2) Performance:
a) Signal input:
b) Recoding data:
1.10.3.8. 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.
b) Switching SW connection
Recording modes can be selected by connecting the switching SW of the following specification to the dry
contact input (PI_1 and PI_2 of TB406) of Recording Control Unit (RCU).
AUTO mode:
JCY-1800/1850 VDR/S-VDR Installation Guide
Records gyro compass signal (Synchro / Step) and/or Ship's speed log signal
as IEC61162-1 sentence formatter
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
Data type: IEC61162-1
Heading Sentence formatter: HDT
Sip speed Sentence formatter: VBW
Images of CH to which the synchronized signals are outputted are
automatically selected and recorded. If the synchronized signals
are outputted from both CH1 and CH2, CH1 has the priority to be
selected.
19
1. Specifications
DOC No. 7ZPJD0387C