HONGFA Key Fob User
System Overview
The KEY FOB communicates bidirectional with the BCM by receiving an LF signal and sending an RF signal. When the LF signal is received by the KEY FOB, the contents of the RF message sent include encrypted data, field intensity, the minimum Byte of the KEY FOBIDE, battery low voltage indicator bit, and check code; When the KEY FOB receives a valid KEY, the contents of the RF message sent include encrypted data, counter, function code, minimum Byte of the KEY FOB IDE, battery low voltage indicator bit and check code.
System Parameters
Operating voltage
- Rated voltage：3VDC
- Operating voltage：2.7VDC~3.3VDC
Temperature Range
- Operating temperature: -20℃ to +60℃
- Storage temperature: -30℃ to +60℃
Static Current
- Static current≤20uA@(3V、25℃)
LF Parameters (Receiving)
| Number | project | parameter |
| 1 | Carrier frequency | 125KHz±5KHz |
| 2 | Data encoding mode | Manchester Encoding with 50% Duty Cycle |
| 3 | Mode of modulation | ASK |
UHF Parameters (transmission)
| Number | project | parameter |
| 1 | Carrier frequency | 315MHz±150KHz |
| 2 | Data encoding mode | Manchester Encoding with 50% Duty Cycle |
| 3 | Mode of modulation | FSK |
System Functions
| Key combination | Key press operation | Function |
| Lock | Short press | Door lock |
| Unlock | Short press | Door unlock |
| Suitcase unlock | Short press | Suitcase unlock |
| Car search | Short press | Car search alarm |
| Lock & Unlock | Long press 4s | KEY FOB learning |
Appearance
- The appearance size is as follows.
- The contents may only be passed on, used, or made known with our express permission. © Hongfa – All rights reserved.
FCC Statement
NOTE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the Federal Communications Commission (FCC) rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications to this equipment not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation. Privacy of communications may not be ensured when using this device.
IC Statement
This device complies with the Industry Canada license exam pt RSS standard(s): Operation is subject to the following two conditions:(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.
The contents may only be passed on, used, or made known with our express permission. © Hongfa – All rights reserved.
