---
title: "Terminal Overfill with FINCH III: Technical Brief"
description: FINCH III 1 compartment wiring diagrams
---
[Skip to content](https://help.titanlogix.com/terminal-overfill-finchiii#main-content)
English
Show submenu for translations
[Training Request Form](https://help.titanlogix.com/kb-tickets/new?hsLang=en)
Open main navigation
Close main navigation
- English
Show submenu for translations
- [Training Request Form](https://help.titanlogix.com/kb-tickets/new)
- www.titanlogix.com
www.titanlogix.com
How can we help you?
- There are no suggestions because the search field is empty.
1. [Titan Help Center](https://help.titanlogix.com/?hsLang=en)
2. [FINCH III Systems (Current)](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en)
3. [Feature Add-On: FINCH III Terminal Overfill](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#feature-add-on-finch-iii-terminal-overfill)
# Terminal Overfill with FINCH III: Technical Brief
#### **Terminal Overfill with FINCH III (Optic Booster) Technical Brief PDF**
[.png?width=144&height=54&name=click%20buttons%20(2).png)](https://help.titanlogix.com/hubfs/Technical%20Brief_Terminal%20Overfill%20with%20FINCH%20III_Optic%20Booster.pdf?hsLang=en)
### Terminal Overfill Feature Overview
The Titan TrueFill system uses the **FINCH III display** as the onboard monitor for terminal overfill protection. When Terminal Overfill, also referred to as Rack Control, is enabled, the FINCH III connects to the truck’s **API rack loading socket** and controls whether the loading rack is permitted to load the truck.
The FINCH III is designed **for fail-safe rack loading operation**. A permissive signal is only provided when the FINCH III system is powered on and all required system checks have passed. If the FINCH III display or connected Titan hardware loses power, the permissive signal is removed and loading will not be allowed to continue.
Before allowing loading at the rack, the FINCH III confirms the following:
- No HH or SPILL rack shutdown condition is active on any compartment.
- No unexpected level movement is detected, such as a transmitter reading jumping from mid-tank directly to 2Lo or SPILL.
- No transmitter or FINCH III system error is active.
- The FINCH III is not connected to Titan Install or in update mode. (Showing RCONN or in Update mode)
- All required compartments are confirmed and all transmitters are properly assigned.
If any of these conditions are not met, the FINCH III changes the rack status to non-permissive and loading is stopped until the condition is resolved.
---
**Need more help?**
Contact one of our Titan Logix's Service Team members for more technical assistance.
**Phone:** 1-877-462-4085 (ext. 2)
**Email:** [service@titanlogix.com](mailto:service@titanlogix.com)
**Request Training:** [Click Here](https://help.titanlogix.com/kb-tickets/new?hsLang=en)
- [Troubleshooting](https://help.titanlogix.com/troubleshooting?hsLang=en#main-content)
- [Error Codes](https://help.titanlogix.com/troubleshooting?hsLang=en#error-codes)
- [Overview](https://help.titanlogix.com/troubleshooting?hsLang=en#overview)
- [Most Common Issues](https://help.titanlogix.com/troubleshooting?hsLang=en#most-common-issues)
- [Alarms](https://help.titanlogix.com/troubleshooting?hsLang=en#alarms)
- [GAUGE Issues](https://help.titanlogix.com/troubleshooting?hsLang=en#gauge-issues)
- [Relays](https://help.titanlogix.com/troubleshooting?hsLang=en#relays)
- [FINCH III Systems (Current)](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#main-content)
- [FINCH III System Overview](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#finch-iii-system-overview)
- [Step 1: Installing Hardware (FINCH III Systems)](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#step-1-installing-hardware-finch-iii-systems)
- [Step 2: Configuring FINCH III Systems](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#step-2-configuring-finch-iii-systems)
- [Step 3: Testing FINCH III Systems](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#step-3-testing-finch-iii-systems)
- [Step 4: Operating FINCH III Systems](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#step-4-operating-finch-iii-systems)
- [Feature Add-On: FINCH III LCR.iQ Integration](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#feature-add-on-finch-iii-lcr-iq-integration)
- [Feature Add-On: FINCH III Terminal Overfill](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#feature-add-on-finch-iii-terminal-overfill)
- [Rack Control](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#rack-control)
- [Feature Add-On: Onboard Pump Control](https://help.titanlogix.com/finch-iii-systems-current?hsLang=en#feature-add-on-onboard-pump-control)
- [FINCH II-W/FINCH II-6W (End of Life)](https://help.titanlogix.com/finch-ii-w-finch-ii-6w-end-of-life?hsLang=en#main-content)
- [Step 1: Installing Hardware (FINCH II-W/6W Systems)](https://help.titanlogix.com/finch-ii-w-finch-ii-6w-end-of-life?hsLang=en#step-1-installing-hardware-finch-ii-w-6w-systems)
- [FINCH II-W/6W Wiring Diagrams](https://help.titanlogix.com/finch-ii-w-finch-ii-6w-end-of-life?hsLang=en#finch-ii-w-6w-wiring-diagrams)
- [Step 2: Configuring FINCH II-W/6W Systems](https://help.titanlogix.com/finch-ii-w-finch-ii-6w-end-of-life?hsLang=en#step-2-configuring-finch-ii-w-6w-systems)
- [3rd party integrations](https://help.titanlogix.com/finch-ii-w-finch-ii-6w-end-of-life?hsLang=en#3rd-party-integrations)
- [FINCH II, FINCH 5332E and FINCH IN-CAB Systems (Discontinued)](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#main-content)
- [FINCH II Display (1 to 2 Compartments)](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-ii-display-1-to-2-compartments)
- [FINCH II Configuration](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-ii-configuration)
- [FINCH 5332E](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-5332e)
- [FINCH 5332E (Red Board)](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-5332e-red-board)
- [FINCH 5332E (Green Board)](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-5332e-green-board)
- [FINCH IN-CAB](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#finch-in-cab)
- [Rack Control Module (RCM) and Titan Supplied API Sockets](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#rack-control-module-rcm-and-titan-supplied-api-sockets)
- [Titan Supplied API Socket Wiring to RCM](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#titan-supplied-api-socket-wiring-to-rcm)
- [Transmitters](https://help.titanlogix.com/transmitters?hsLang=en#main-content)
- [TD100 Transmitter](https://help.titanlogix.com/transmitters?hsLang=en#td100-transmitter)
- [TD100 Transmitter: 4-20mA Output](https://help.titanlogix.com/transmitters?hsLang=en#td100-transmitter-4-20ma-output)
- [Upgrading TD80 \> TD100](https://help.titanlogix.com/transmitters?hsLang=en#upgrading-td80-td100)
- [TD80 (Discontinued)](https://help.titanlogix.com/transmitters?hsLang=en#td80-discontinued)
- [Titan Probes](https://help.titanlogix.com/titan-probes?hsLang=en#main-content)
- [Overview](https://help.titanlogix.com/titan-probes?hsLang=en#overview)
- [Probe: Dual Rod](https://help.titanlogix.com/titan-probes?hsLang=en#probe-dual-rod)
- [Probe: Coaxial](https://help.titanlogix.com/titan-probes?hsLang=en#probe-coaxial)
- [Titan Install & Titan Portal](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#main-content)
- [Step 1: Register your Company](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#step-1-register-your-company)
- [User Guide](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#user-guide)
- [Getting Started](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#getting-started)
- [Programming your Strapping Chart](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#programming-your-strapping-chart)
- [Maintenance and Troubleshooting](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#maintenance-and-troubleshooting)
- [FINCH Display Configuration](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#finch-display-configuration)
- [Release Notes](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#release-notes)
- [Administration](https://help.titanlogix.com/titan-install-titan-portal?hsLang=en#administration)
- [SensorLink](https://help.titanlogix.com/sensorlink?hsLang=en#main-content)
- [Overview](https://help.titanlogix.com/sensorlink?hsLang=en#overview)
- [Programming Your Transmitter](https://help.titanlogix.com/sensorlink?hsLang=en#programming-your-transmitter)
- [Configuring your FINCH Display](https://help.titanlogix.com/sensorlink?hsLang=en#configuring-your-finch-display)
- [Troubleshooting](https://help.titanlogix.com/sensorlink?hsLang=en#troubleshooting)
- [Upgrading Titan Products](https://help.titanlogix.com/upgrading-titan-products?hsLang=en#main-content)
- [Upgrade FINCH5332E -\> FINCH II - W or 6W](https://help.titanlogix.com/upgrading-titan-products?hsLang=en#upgrade-finch5332e-finch-ii-w-or-6w)
- [Adding Overfill Prevention to Your Tank](https://help.titanlogix.com/upgrading-titan-products?hsLang=en#adding-overfill-prevention-to-your-tank)
- [Legacy Products](https://help.titanlogix.com/legacy-products?hsLang=en#main-content)
- [Gateway](https://help.titanlogix.com/legacy-products?hsLang=en#gateway)
- [SFT 881](https://help.titanlogix.com/legacy-products?hsLang=en#sft-881)
- [Flo Pro 9100](https://help.titanlogix.com/legacy-products?hsLang=en#flo-pro-9100)
- [TPZ Liquid Level Measurement System](https://help.titanlogix.com/legacy-products?hsLang=en#tpz-liquid-level-measurement-system)
- [FGI Products](https://help.titanlogix.com/legacy-products?hsLang=en#fgi-products)
- [MIC 10](https://help.titanlogix.com/legacy-products?hsLang=en#mic-10)
- [Service Bulletins](https://help.titanlogix.com/service-bulletins?hsLang=en)
[](https://www.titanlogix.com/support/)
The Leader in Mobile Liquid Measurement Solutions
Copyright © 2026, Titan Logix Corp.