1. Introduction
The Optex Wireless 2000 Door/Window Contact Transmitter, model TC-10U, is a battery-powered device designed to detect the opening and closing of doors and windows. It transmits a wireless signal to a compatible Optex Wireless 2000 annunciator system. This unit is suitable for both indoor and outdoor use, provided it is not exposed to direct rain.
Key Features:
- Battery-powered operation for flexible placement.
- Compatible with Optex Wireless 2000 annunciator systems.
- Designed for indoor and outdoor installation (avoid direct rain exposure).
- Powered by a single CR123 3V lithium battery.
- Includes a low battery signal indicator.
2. Safety Information
General Safety:
- Read all instructions before installation and operation.
- Do not expose the device to direct rain or immerse it in water.
- Keep out of reach of children.
- Do not attempt to disassemble or repair the unit yourself. Refer to qualified service personnel.
Battery Safety:
- Use only CR123 3V lithium batteries.
- Insert batteries with correct polarity (+/-).
- Do not mix old and new batteries, or different types of batteries.
- Dispose of used batteries according to local regulations.
- Remove batteries if the device will not be used for an extended period.
3. Package Contents
Verify that all items are present in your package:
- Optex Wireless 2000 Door/Window Contact Transmitter (TC-10U)
- Mounting hardware (e.g., screws, adhesive pads)
- Instruction Manual (this document)
Note: CR123 3V lithium battery is required but not included.
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the transmitter unit.
- Open the compartment cover.
- Insert one CR123 3V lithium battery, observing the correct polarity (+ and -).
- Close the battery compartment cover securely.
4.2 Mounting the Transmitter
The transmitter consists of two parts: the main sensor unit and a magnet. These two parts must be mounted in close proximity (typically within 1/2 inch or 1.2 cm) on a door/window and its frame.
- Choose a suitable location on the door/window frame and the moving part of the door/window. Ensure the surfaces are clean and dry.
- Mount the main sensor unit on the stationary frame.
- Mount the magnet on the moving part of the door or window, aligning it with the marked area on the main sensor unit.
- Use the provided screws or adhesive pads for secure installation.
- Test the alignment by opening and closing the door/window. The two parts should separate and come together smoothly without obstruction.

Image 1: Optex Wireless 2000 Door/Window Contact Transmitter, showing the main sensor unit and the smaller magnet unit. The main unit has "OPTEX" embossed on its surface.
4.3 Pairing with an Annunciator System
Refer to the instruction manual of your specific Optex Wireless 2000 annunciator system (e.g., RC-10, TR-10U, RC-20U) for detailed pairing instructions. Generally, the process involves:
- Placing your annunciator system into pairing mode.
- Activating the TC-10U transmitter by separating and then bringing together the sensor and magnet units.
- Confirming successful pairing on your annunciator system.
This transmitter is compatible with Optex parts such as RC-10, TR-10U, VX-402R, BX-80NR, AX-100TFR, AX-200TFR, CX-702R, and EX-35R.
5. Operation
5.1 Basic Functionality
Once installed and paired, the Optex TC-10U transmitter will send a signal to your annunciator system whenever the door or window it is mounted on is opened (i.e., when the main sensor unit and the magnet separate). The annunciator system will then trigger its programmed alert (e.g., chime, alarm).
5.2 Low Battery Signal
The transmitter features a low battery signal. When the battery voltage drops to a critical level, the unit will transmit a low battery alert to the paired annunciator system. This signal indicates that the CR123 3V lithium battery needs to be replaced soon.
6. Maintenance
6.1 Battery Replacement
When a low battery signal is received, replace the CR123 3V lithium battery promptly to ensure continuous operation.
- Open the battery compartment cover.
- Remove the old battery.
- Insert a new CR123 3V lithium battery, ensuring correct polarity.
- Close the battery compartment cover securely.
- Dispose of the old battery responsibly according to local regulations.
6.2 Cleaning
Clean the exterior of the transmitter with a soft, dry cloth. Do not use abrasive cleaners, solvents, or excessive moisture, as these can damage the unit.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Transmitter not responding / No signal | Dead or low battery | Replace the CR123 3V lithium battery. |
| Incorrect battery polarity | Ensure the battery is inserted with correct + and - orientation. | |
| Sensor and magnet misaligned or too far apart | Adjust the position of the sensor and magnet so they are within 1/2 inch (1.2 cm) when the door/window is closed. | |
| Not paired with annunciator system | Refer to Section 4.3 and your annunciator manual for pairing instructions. | |
| Intermittent signals | Weak battery | Replace the battery. |
| Interference from other wireless devices | Relocate the transmitter or annunciator system if possible, or identify and mitigate interference sources. |
8. Specifications
- Model: TC-10U
- Brand: Optex
- Power Source: Battery powered
- Battery Type: CR123 3V Lithium (not included)
- Voltage: 3 Volts
- Item Weight: Approximately 4 ounces (113 grams)
- Package Dimensions: Approximately 3.8 x 3.5 x 1.6 inches (9.65 x 8.89 x 4.06 cm)
- Installation Environment: Indoor/Outdoor (not in direct rain)
- Compatibility: Optex Wireless 2000 annunciator systems (e.g., RC-10, TR-10U, RC-20U) and other specified Optex parts.
9. Warranty and Support
For warranty information and technical support, please refer to the official Optex website or contact your authorized Optex dealer. Keep your purchase receipt as proof of purchase.





