Allen-Bradley 1747-UIC USB to DH-485 Converter Module

Configured for bridging USB to DH-485 communication in SLC 500 network diagnostic and programming access, the Allen-Bradley 1747-UIC (1747-UIC USB to DH-485 converter) provides direct physical and electrical protocol translation between USB host interfaces and DH-485 serial network layers. The device executes signal adaptation between 12 Mbps USB signaling and 19.2 Kbps DH-485 communication channels, with integrated status indication via three LED indicators for operational state monitoring.

Suffix Breakdown & Model Matrix

No structured suffix segmentation is defined for 1747-UIC. The model is a single-part converter designation within the SLC 500 communication accessory family.

Hardware Specifications

Allen-Bradley Industrial Communication Interface Behavior

The 1747-UIC implements protocol-level conversion between USB transaction framing and DH-485 multi-drop serial signaling. It enforces single-instance host binding (1 converter per computer), preventing bus arbitration conflicts at the driver layer. The internal communication stack maintains timing alignment between USB polling cycles and DH-485 token-passing behavior to preserve deterministic message sequencing in SLC 500 diagnostic access paths.

Frequently Asked Questions (FAQ)

Q: Can the 1747-UIC operate with multiple instances on one host PC?
A: No. The driver architecture enforces a single active converter instance per computer to prevent USB endpoint contention and DH-485 session conflicts.

Q: Does the converter maintain timing integrity between USB and DH-485 layers?
A: Yes. It performs buffering and scheduling to align USB packet bursts (12 Mbps) with DH-485 serial timing at 19.2 Kbps.

Q: What happens if USB power drops below operating threshold?
A: The module resets communication state and drops both USB and DH-485 sessions, requiring reinitialization after stable power restoration.

Field Installation Guidelines

Install the converter in a stable USB host environment with direct port connection; avoid passive hubs where possible. Maintain proper RS-485/DH-485 cabling discipline with twisted shielded pair routing and single-point grounding of the shield. Ensure cable length and routing avoid high-noise motor drive lines. Only one converter should be active per workstation to avoid driver-level resource conflicts. Verify LED status indicators before initiating network scan or RSNetWorx communication sessions.