JRC JCY-1800 Instruction Manual page 31

4.3.5.2. GPS Selection TAB screen
Set up the "GPS selection" when the "GPS (main+sub)" is selected as a connection equipment.
1) Switch position
Select the logic of dry contact signal which is outputted by a GPS switcher.
The GPS switcher is connected to "TB406 PI-3" which is a terminal in the RCU.
The VDR/S-VDR records the GPS equipment (main or sub) currently recorded as EVENT.
4.3.5.3. GPS Data TAB screen
1) Date and Time
The sentence which acquires "Date and Time" data is a "ZDA" sentence as standard.
When the GPS does not output a ZDA sentence, change the sentence to record into "RMC".
2）Datum
When the GPS does not output a DTM sentence, clear the DTM setting.
JCY-1800/1850 VDR/S-VDR Maintenance Software Instruction Manual
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4. Installation, Setup and Check
DOC No. 7ZPNA4014