3.2 KiB
KERONG KR-S79_20-JST
Status: Electrical characterization experimentally validated.
The information on this page comes from measurements performed on a new original Boks replacement lock. It may differ from other KR-S79 variants.
Identification
| Item | Value |
|---|---|
| Manufacturer | KERONG |
| Model | KR-S79 |
| Variant | KR-S79_20-JST |
| Revision | 2023.10_KERONG |
| Manufacturing date | 17-10-2023 |
| Patent | ZL.201821837049.2 |
Characteristics
| Parameter | Value |
|---|---|
| Supply voltage | 8 to 24 V DC |
| Maximum current | 100 mA |
| Auxiliary contact | 3 A max |
| Connector | JST |
| Harness length | 20 cm |
Manufacturer Pinout
| Color | Function |
|---|---|
| Red | +V, 8 to 24 V |
| Orange | GND |
| Yellow | SIG |
| Black | COM |
| Green | NO |
| White | NC |
Boks Harness Mapping
| Boks Side | Lock Side | Function |
|---|---|---|
| Blue | Red | +V |
| White | Orange | GND |
| Green | Yellow | SIG |
| Yellow | Black | COM |
| Black | Green | NO |
| Red | White | NC |
Operation
Power Supply
The lock is continuously powered between:
| Pin | Function |
|---|---|
| Red | +8 to +24 V |
| Orange | GND |
At rest, the lock remains closed.
Opening Command
Opening is triggered by a positive pulse on the SIG input.
Validated test:
| Action | Result |
|---|---|
| SIG connected to +V | Opens |
| SIG connected to GND | No effect |
The lock therefore includes its own control electronics.
Feedback Contact
The lock includes a changeover contact.
Experimental Measurements
Locked
| Measurement | Result |
|---|---|
| COM to NO | Continuity |
| COM to NC | Open |
Unlocked
| Measurement | Result |
|---|---|
| COM to NO | Open |
| COM to NC | Continuity |
Note:
OpenParcelBox relies on the experimentally measured behavior rather than assumptions from markings alone.
State Detection
The contact changes state as soon as the latch leaves the locked position.
It is therefore not necessary to wait for the mechanism to complete its full travel before detecting unlocking.
This allows the firmware to detect the lock state almost immediately.
Wiring Diagram
+8 to 24 V
|
+-- Red (+)
KR-S79
+-- Orange (GND)
Yellow (SIG): positive pulse to +V opens the lock
Black (COM): common feedback contact
Green (NO): closed when locked
White (NC): closed when unlocked
Validation
| Function | Status |
|---|---|
| Power supply | Validated |
| Voltage | Validated |
| SIG command | Validated |
| Command polarity | Validated |
| COM contact | Validated |
| NO contact | Validated |
| NC contact | Validated |
| Opening detection | Validated |
Use in OpenParcelBox
This lock is compatible with the OpenParcelBox architecture.
The Seeed Studio XIAO BLE nRF52840 must:
- Keep the lock powered.
- Generate a positive pulse on
SIGwhen opening is requested. - Monitor the
COM/NCcontact to confirm that the latch has left the locked position.
The COM/NC contact changes state as soon as the latch is released. It provides reliable feedback for confirming opening without waiting for a fixed delay.
The COM/NO contact is not currently used by OpenParcelBox.