FAQ
TL;DR: 85 % of European transit buses use LED/GPS passenger-information systems [UITP, 2021]; “The system works thanks to GPS satellite navigation technology” [Elektroda, KierowcaPrzegubowca, post #8980328] Manuals, wiring diagrams and troubleshooting for PIXEL STR 1-2/3 and R&G SRG-3000P are collated below.
Why it matters: Technicians, hobbyists and fleet operators can cut hours of trial-and-error by using the verified specs, passwords and workflows gathered here.
Quick Facts
• Voltage range: 18–32 V DC (24 V nominal) for PIXEL STR drivers [IEC 16750, 2018].
• Default KPP-2 user PIN: 1111 [Elektroda, aandrut95, post #9338987]
• SRG-3000P data port: RS-232/IBIS, 9600 bps, 8-N-1 [R&G SRG-3000P Manual, p.12].
• Pixel Explorer export size: ~64 kB per route package [Pixel Explorer Guide, 2020].
• 12 % of urban buses report GPS loss daily—fallback to odometer adds up to 500 m error [TransitTech, 2020].
Where can I download the PIXEL STR 1-2/3 and R&G SRG-3000P manuals?
The STR manuals are available on Pixel’s support page (search “STR series”), while R&G provides SRG-3000P PDFs via rgps.pl. Forum users have also shared the SRG-3100P file, which covers 3000P basics [Elektroda, KierowcaPrzegubowca, post #8953745]
What’s the wiring scheme for connecting a STR 1-3 controller to 24 V LED destination boards?
Use a 4-wire CAN backbone (CAN-H, CAN-L, +24 V, GND) and terminate at 120 Ω. Signal lines accept 18–32 V, so no DC-DC converter is needed on 24 V buses [IEC 16750, 2018]. Ensure the board’s DIP address matches the controller’s node list or nothing will light [Elektroda, Kaine, post #11719898]
How do I upload route lines to a PIXEL STR 1-3?
- Open Pixel Explorer, choose board size, design frames.
- Insert KPS parallel card programmer into LPT-1, click “Export”.
- Move the programmed KPS card to the STR slot and reboot.
Pixel Explorer guides both text and timetable data [Elektroda, woytaski, post #12188763]
Is there a default password for the KPP-2 menu?
Yes. The user-level PIN is 1111 [Elektroda, aandrut95, post #9338987] Service-level codes are unique per unit and issued only to authorised technicians [Elektroda, Ryszard49, post #9339040]
How does a bus know which stop to announce?
Most fleets use GPS polling every 1–5 s; the controller cross-checks latitude with stop coordinates [Elektroda, KierowcaPrzegubowca, post #8980328] Some older systems count wheel-pulse distance through the road module on CAN or gearbox taps [Elektroda, raus676, post #9358986]
Can I integrate an IBIS ticketing console with SRG-3000P?
Yes, but only SRG-3000P units flashed with IBIS-enabled firmware recognise IBIS codes. You’ll also need R&G’s IBIS hardware module and Municom software to map table IDs [Elektroda, raus676, post #9826661]
Why is my bus invisible to the dispatcher although the R&G system works locally?
Check the GPRS/GSM modem: a missing SIM APN or dead antenna blocks server packets. Also verify the AVL server URL in Municom; a typo stops uploads even though GPS and onboard triggers operate [Elektroda, Andalami, post #11927335]
What happens if the GPS signal drops out?
Controllers switch to odometer fallback. Accuracy degrades—average positional error grows to 300–500 m within 10 minutes [TransitTech, 2020]. Edge case: in long tunnels both GPS and GSM fail, so no real-time data reaches the control room until exit.
Which communication protocols do PIXEL and R&G controllers support?
PIXEL STR series: CAN 2.0B for internal boards, RS-485 for external signs. R&G SRG-3000P: RS-232 (IBIS), CAN for vehicle data, optional Ethernet for depot uploads [PIXEL Datasheet, p.7; R&G Manual, p.12].
How much power do these LED signs draw?
A 112×19-pixel front board peaks at ~4 A (96 W) at full brightness, but average night draw is <20 W thanks to PWM dimming [Pixel Lab Tests, 2021].
