EMX 9120-1 VIPER-I Infinity-Compatible UHF RFID Vehicle Tag Details
The EMX 9120-1 VIPER-I is a clear adhesive-backed passive UHF RFID credential designed for long-range vehicle identification and access-control applications. EMX specifically identifies the Viper-I configuration for compatible Infinity RFID reader applications.
The VIPER platform operates in the 902-928 MHz UHF frequency range and supports EPC Class 1 Gen2 and ISO 18000-6C standards. Its compact, low-profile design allows installation on a suitable vehicle windshield or headlamp while providing an EMX-published average read range of approximately 25-30 ft.
Compatible With
- Compatible Infinity UHF RFID reader applications
- Select automated vehicle identification systems configured for the VIPER-I credential format
- Access-control systems programmed for the required VIPER-I facility code and credential ID
Compatibility should not be determined by UHF frequency alone. Confirm the Infinity reader model, reader generation, credential format, facility code, credential ID range, and access-control programming before ordering replacement or additional tags.
What the VIPER-I Does
The VIPER-I is a passive RFID credential. It does not contain a user-replaceable battery and does not directly activate a gate operator. When the tag enters the RF field of a compatible reader, the reader obtains the credential information and passes it to the connected access-control system.
The access-control controller then determines whether the credential is authorized and can issue the appropriate access command to a gate, parking barrier, or other controlled entrance.
Features and Specifications
| Specification | Details |
| Manufacturer | EMX Industries |
| Part Number | EMX-9120-1 |
| Product Designation | VIPER-I |
| Product Type | Passive UHF RFID vehicle credential |
| Reader Association | Compatible Infinity RFID reader applications |
| Operating Frequency | 902-928 MHz UHF |
| RFID Standards | EPC Class 1 Gen2 and ISO 18000-6C |
| Published Average Read Range | Approximately 25-30 ft, installation dependent |
| Dimensions | Approximately 4.75 x 0.625 x 0.042 inches |
| Construction | Clear adhesive-backed RFID tag |
| Recommended Mounting Surface | Suitable windshield or headlamp |
| Mounting Orientation | Vertical or horizontal |
| Battery Required | No |
25-30 ft Published Read Range
EMX publishes an average read range of approximately 25-30 ft for the VIPER platform. Actual range depends on the reader, antenna, RF settings, credential position, vehicle construction, windshield composition, headlamp material, nearby metal, and surrounding RF environment.
The published range should not be treated as a guaranteed distance for every vehicle. Test the credential and mounting position with representative vehicles whenever possible.
Windshield and Headlamp Mounting
The VIPER-I uses a clear pressure-sensitive adhesive backing and can be installed vertically or horizontally on a suitable windshield or headlamp surface.
Some windshields use metallic coatings, heated layers, solar-control materials, or other construction that can reduce UHF RFID performance. An RF-transparent windshield area or suitable headlamp mounting location may provide better results on affected vehicles.
VIPER-I vs VIPER-R and VIPER-N
- VIPER-I: Compatible with select Infinity RFID reader applications.
- VIPER-R: Compatible with select Rosslare RFID reader applications.
- VIPER-N: Compatible with select Nedap RFID reader applications.
- TRES-900-VIPER: Current EMX VIPER family designation for its clear UHF RFID tag platform.
These credentials can look nearly identical and operate in the same UHF frequency range, but the reader-system designation is important. Do not substitute one VIPER suffix for another without confirming reader and credential compatibility.
Facility Code and Credential ID
Current distributor ordering information for EMX-9120-1 allows facility-code selection from 1 through 255 and credential IDs from 1 through 65,535. Existing access-control systems may require a specific facility code and sequential ID range.
Before ordering additional credentials, verify the facility code and credential numbers from the access-control database, an existing working credential, previous purchase records, or the system administrator.
Credential Programming Matters
Ordering the correct physical VIPER-I tag does not by itself guarantee access. The access-control system must also recognize the credential programming.
If the reader detects a tag but access is denied, verify the facility code, credential number, controller format, enrollment status, access level, schedules, and gate activation interface before replacing the credential or reader.
Common Applications
- Automatic vehicle identification
- Residential community gate access
- Apartment and condominium parking
- Commercial parking facilities
- Employee vehicle access
- Industrial facility entrances
- Hands-free long-range access control
Similar Parts That Are Not Automatically Interchangeable
- EMX VIPER-R credentials for Rosslare applications
- EMX VIPER-N credentials for Nedap applications
- EMX TRES-900-WS421 windshield tags
- EMX TRES-900-HT hang tags
- Generic EPC Gen2 UHF windshield tags with unverified programming
- Other Infinity-compatible credentials with different formats or ID structures
Package Contents
- One EMX 9120-1 VIPER-I clear UHF RFID credential unless the store quantity specifically states otherwise
The Infinity RFID reader, antenna, access-control panel, gate operator, credential programming service, and other system hardware are not automatically included.
Technician Note
If the reader acknowledges the VIPER-I but the gate does not open, the RFID reading portion may be operating correctly. Check enrollment, facility code, credential ID, controller programming, access permissions, schedules, and the gate activation interface.
If the tag is not detected, verify the installed reader is compatible with VIPER-I, check the credential mounting position, inspect for physical damage, confirm reader aiming and RF power, and consider whether the windshield or headlamp material is reducing UHF performance.
Before Ordering Checklist
- Confirm manufacturer part number EMX-9120-1.
- Confirm the required credential version is VIPER-I.
- Verify the installed system uses a compatible Infinity RFID reader.
- Confirm the required facility code.
- Confirm the credential ID or sequential ID range.
- Verify access-control format and enrollment requirements.
- Check the intended windshield or headlamp mounting location.
- Check for metallic or RF-reducing windshield construction.
- Confirm package quantity and any credential programming requirements.
Installation and Service Notes
Clean and prepare the intended mounting surface before applying the adhesive credential. When practical, test the proposed tag location before permanent attachment.
Avoid folding, creasing, cutting, puncturing, or repeatedly removing the tag. Physical damage to the internal RFID antenna can reduce read range or make the credential unusable.
Professional Advisory
The VIPER-I is an access-control credential only. It does not provide vehicle presence detection, obstruction detection, photoelectric safety, or entrapment protection.
Do not use an RFID access system to bypass required photo eyes, monitored safety edges, vehicle safety detectors, emergency access, fire access, or other required gate operator safety circuits.
Product Questions and Answers
What reader is the EMX 9120-1 VIPER-I designed for?
EMX identifies VIPER-I as the VIPER credential version for compatible Infinity RFID reader applications. Confirm the exact reader model, facility code, credential format, and controller requirements before ordering.
What is the published read range of the EMX VIPER-I?
EMX publishes an average VIPER read range of approximately 25-30 ft. Actual range depends on the reader, antenna, RF settings, vehicle, tag location, windshield or headlamp construction, and surrounding environment.
Can the VIPER-I be mounted on a windshield or headlamp?
Yes. EMX identifies the clear VIPER tag for suitable windshield or headlamp mounting and allows vertical or horizontal orientation. Vehicle materials can affect RFID performance, so test the mounting location when practical.
Can I replace VIPER-I with VIPER-R or VIPER-N?
Do not assume so. EMX identifies VIPER-I for Infinity readers, VIPER-R for Rosslare readers, and VIPER-N for Nedap readers. Confirm the reader platform and credential programming before substituting versions.
Does EMX 9120-1 VIPER-I require a battery?
No. VIPER-I is a passive UHF RFID credential. It receives energy from the compatible reader's RF field and does not require a user-replaceable battery.
What facility code and ID numbers are available for EMX 9120-1?
Current distributor ordering information lists selectable facility codes from 1 through 255 and credential IDs from 1 through 65,535. Verify the values required by the existing access-control system before ordering.
Why does the reader detect my VIPER-I but the gate does not open?
If the reader recognizes the credential, verify facility code, credential ID, enrollment, controller format, access permissions, schedules, and the gate activation interface before replacing the tag or reader.
What should I verify before ordering additional VIPER-I credentials?
Confirm the Infinity reader model, EMX-9120-1 part number, facility code, credential ID range, access-control format, vehicle mounting location, order quantity, and any programming requirements before ordering.
