Honeywell 51196694-928/U1 Trackball Upgrade Board

Honeywell 51196694-928/U1 Trackball Upgrade Board

Configured for cursor control and legacy interface adaptation in Honeywell operator stations, the Honeywell 51196694-928/U1 (51196694-928 Trackball Upgrade Board) provides direct physical and electrical signal processing via a standard PS/2 connection layout.

Hardware Specifications

4-20 mA HART Loop Protocol & DCS Integration

While this specific hardware board processes dedicated low-voltage cursor signals rather than field-level 4-20 mA loops, it maintains complete physical compatibility with Honeywell distributed control system (DCS) operator terminals. The board utilizes channel-to-channel isolation principles to suppress electrical noise and transient interference within the console enclosure. Integration into control rooms requires proper grounding of the interface wiring to prevent ground loops and maintain stable cursor positioning across operator interfaces.

Frequently Asked Questions

Q: Does the 51196694-928/U1 support hot-swapping within active operator stations?

A: No. Power must be isolated from the operator station subassembly prior to installing or removing the trackball upgrade board to prevent logic-level voltage spikes and bus corruption.

Q: What signal conversion mechanism is utilized on the PCB?

A: The board processes raw mechanical trackball quadrature or displacement inputs and converts them directly into standard PS/2 protocol data packets for system communication.

Field Installation Guidelines

• Ensure all power feeds to the target operator console are locked out before opening the trackball assembly housing.
• Mount the industrial-grade PCB securely using the designated mounting standoffs inside the trackball enclosure.
• Verify that the PS/2 interface cable is routed away from high-voltage AC power lines and electromagnetic interference (EMI) sources.
• Inspect pin alignment on multi-pin connectors prior to final physical seating to avoid bent contacts.