Product Details
The ABB LTU-785 SM9-3055.061.00, also cataloged as the LTU-785 Line Transceiver Terminal Units, operates as a dedicated hardware component for low-voltage signal conditioning and serial protocol communication within INFI 90 control network interfaces.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | LTU-785 |
| Part Number | SM9-3055.061.00 |
| Brand | ABB |
| Product Type | Line Transceiver Terminal Units |
| Origin | Sweden |
| Weight | 3.03 kg |
| Dimensions | 120 x 75 x 35 mm |
| Operating Temp | -40 to +85 deg C |
| Power Consumption | 24 VDC input voltage |
| Output Type | Relay contacts |
| Communication Protocols | Modbus RTU, IEC 60870-5-103 |
High-Density I/O Scaling and Firmware Flash Compatibility
The line transceiver module routes serial data streams across Modbus RTU and IEC 60870-5-103 network layers, executing continuous loop transfers without degrading backplane bus communication velocity. Internal signal conditioning paths support high-density I/O scaling across field termination racks while isolating relay outputs from transient voltage surges. Built-in firmware flash compatibility preserves deterministic protocol execution across wide temperature gradients.
Frequently Asked Questions
Q: What communication protocols are natively executed by the LTU-785 module?
A: The LTU-785 SM9-3055.061.00 executes serial communication over Modbus RTU and IEC 60870-5-103 protocol stacks.
Q: How is the physical grounding path established for the line transceiver unit?
A: Physical earth grounding is secured mechanically through the metallic retaining hardware when mounted directly to the grounded subrack frame.
Q: Is the LTU-785 module capable of cold-climate operation?
A: Yes, the unit is rated for continuous operational exposure across ambient temperatures ranging from -40 to +85 deg C.
Field Installation Guidelines
- Isolate primary 24 VDC power feeds and field control loops prior to installing or removing the LTU-785 unit.
- Wear an anti-static wrist strap connected to cabinet earth ground before handling the transceiver board.
- Align the 120 x 75 x 35 mm unit into its designated mounting slot and tighten retaining screws to secure mechanical grounding.
- Wire field relay outputs and serial communication lines using recommended wire gauges, ensuring terminal screws are torqued tightly.
- Separate low-voltage serial bus cabling from 230 VAC/480 VAC power lines by a minimum distance of 200 mm to prevent electromagnetic interference.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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