Description
Key Technical Specifications
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Model Number: IS200ISBBG1BAA
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Manufacturer: General Electric (GE) – Industrial Solutions
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Function: InSync Bus Bypass – repeats / isolates the ISBus coax LAN between Mark VI daughter-cards
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Power Supply: 24 VDC (±10 %), 2-pin terminal strip (E4)
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Connectors:
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P1 Full-Duplex coax
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P2 XMIT data out
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P3 RCV data in
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P4 24 VDC input
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Isolation: 2 kV basic board-to-board; transformer-coupled LAN segment
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Indicators: 2 LEDs – yellow (activity), green (power)
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Jumpers: 2 berg jumpers for interlock bypass and LAN termination
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Relays: 2 on-board relays for bus-isolation switching
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Mounting: DIN-rail (35 mm) with four corner screws; 8.5 × 6.2 × 1.5 in
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Operating Temperature: –20 °C…+60 °C
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Weight: < 15 oz (0.4 kg)
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Status: Factory discontinued – new & tested spares available
IS200CABPG1BAA
Field Application & Problem Solved
In the field the biggest headache is a cracked ISBus coax or a failed transceiver that drops half the Mark VI rack offline. The IS200ISBBG1BAA solves that by sitting between card segments—if the primary LAN path fails the board repeats the signal on a secondary coax, keeps the 24 V rail isolated, and still gives you LED confirmation that traffic is moving. You’ll typically find one per card-file on EX2100 exciter sections—bolt it to the DIN rail, land the four connectors, and you’re back online without rewiring the whole rack. Core value: it collapses a LAN repeater, power isolator, and fault LED into one 0.4 kg plate you can swap in two minutes while the turbine is on turning gear
In the field the biggest headache is a cracked ISBus coax or a failed transceiver that drops half the Mark VI rack offline. The IS200ISBBG1BAA solves that by sitting between card segments—if the primary LAN path fails the board repeats the signal on a secondary coax, keeps the 24 V rail isolated, and still gives you LED confirmation that traffic is moving. You’ll typically find one per card-file on EX2100 exciter sections—bolt it to the DIN rail, land the four connectors, and you’re back online without rewiring the whole rack. Core value: it collapses a LAN repeater, power isolator, and fault LED into one 0.4 kg plate you can swap in two minutes while the turbine is on turning gear
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Installation & Maintenance Pitfalls (Expert Tips)
Coax F-Connectors Crack at 1 Nm – No More
The F-type bulkheads are brass—over-tighten and the threads strip. Use a 7/16 wrench and stop when the collar seats; then tug-test the cable. A loose F-connector gives “LAN timeout” that looks like a board failure
The F-type bulkheads are brass—over-tighten and the threads strip. Use a 7/16 wrench and stop when the collar seats; then tug-test the cable. A loose F-connector gives “LAN timeout” that looks like a board failure
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Jumpers Set Bus Termination – Photo Before You Swap
JP1 and JP2 select termination and interlock bypass. If you mirror the board the jumpers land on the wrong pads and the LAN ring never closes. Cell-phone a picture of the old card before you pull it
JP1 and JP2 select termination and interlock bypass. If you mirror the board the jumpers land on the wrong pads and the LAN ring never closes. Cell-phone a picture of the old card before you pull it
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24 V Polarity Reversed = Dead Board
The E4 terminal is marked “+ / –”; land 24 V backwards and the on-board TVS diode crowbars, blowing the 2 A fuse. Always meter before you torque the screws—reverse-polarity is not field-repairable.
The E4 terminal is marked “+ / –”; land 24 V backwards and the on-board TVS diode crowbars, blowing the 2 A fuse. Always meter before you torque the screws—reverse-polarity is not field-repairable.
Card Is Discontinued – Verify Spare Before You Need It
Factory stock is gone; new & tested spares are available but lead-time can be 6-8 weeks. Keep one on the shelf or you’ll discover the weakness when the only spare on-site is a cracked coax bulkhead
Factory stock is gone; new & tested spares are available but lead-time can be 6-8 weeks. Keep one on the shelf or you’ll discover the weakness when the only spare on-site is a cracked coax bulkhead
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Technical Deep Dive & Overview
Internally the card is a passive LAN repeater bolted to a 2 kV isolation barrier. The InSync transformer couples the 75 Ω coax segment while the relays switch the secondary path; the yellow LED flashes with traffic and the green LED confirms power. No firmware—pure hardware—so you can swap it without reloading parameters; just remember to torque the coax nuts or the LAN will fault on the first packet
Internally the card is a passive LAN repeater bolted to a 2 kV isolation barrier. The InSync transformer couples the 75 Ω coax segment while the relays switch the secondary path; the yellow LED flashes with traffic and the green LED confirms power. No firmware—pure hardware—so you can swap it without reloading parameters; just remember to torque the coax nuts or the LAN will fault on the first packet
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