Brandywine Portable Timing Unit - Getting Started with the PTU; Powering Up the PTU Unit; Network and Reference Configuration

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MANUAL&P/N&900000118&REV&D&
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4 Getting(Started(
Figure+1+-+Portable+Timing+Unit+
4.1 Powering(up(the(PTU(
The!PTU!can!be!powered!from!110Vac!via!the!AC!power!cable,!or!from!external!
12Vdc!via!the!DC!power!cable.!!Both!cables! p lug!into!J11,!a!5-pin!power!connector!
on!the!rear!of!the!unit.!!The!PTU!must!be!turned!on!for!battery!charging!to!
commence.!(See!Figure!22!-!PTU!Rear!Panel)!!
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A!front!panel!power!switch!is!used!to!turn!the!unit!on.!
4.2 Setting(the(Network(Address(
Connect!the!unit!to!an!Ethernet!sw itch!via!J10,!the!Ethernet!connector.!!The!PTU!
uses!a!10BaseT!Ethernet!interface!without!Auto-MDIX,!so!if!a!connection!is!to!be!
made!directly!to!a!laptop,!a!cross-over!Ethernet!cable!must!be!used.!
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4.2.1 Discovering(the(IP(Address.(
Power!the!PTU!off,!and!then!power!it!back!on.!!Press!and!hold!the!display!switch.!!
The!Unit!IP!address!will!be!shown!after!approximately!30!seconds.!
4.2.2 GPS(Operation(
When!GPS!is!selected!as!reference,!ensure!that!a!GPS!antenna!is!connected!to!the!
unit.!!The!chassis!mounted!antenna!can!be!used!by!simply!connecting!J1!to!J2!with!a!
short!coax!cable!(provided.)!!Alternatively,!an!external!antenna!can!be!used!by!
connecting!it!directly!to!J1,!the!GPS!receiver!input.!
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It!typically!takes!approximately!five!to!six!minutes!for!the!PTU!to!complete!its!
Rubidium!warm-up!cycle,!acquire!satellites!and!start!displaying!valid!time.!!Until!it!
does,!the!PTU!will!display!a!simple!count!value!starting!from!0.!!In!a!cold!start!