Numeric Keypad
16 Key Industrial Locker Keypad With TFT Screen KY3688LP-F2
KY3688LP-F2 is a 16 key stainless steel locker keypad with a 3.5-inch TFT display built into the panel, so prompts and password entry share one rear mounted assembly.
Product Overview
KY3688LP-F2 is a 16 key stainless steel locker keypad with a 3.5-inch TFT display built into the panel, so prompts and password entry share one rear mounted assembly. It is specified by locker, kiosk and access control builders who need a sealed metal entry point that survives outdoor cabinets. The keypad answers over RS232 and enters sleep mode when idle, which keeps current draw low on shared power budgets.
- Display and keypad arrive as one rear mounted unit, removing a separate screen cutout and its gasket from the cabinet design
- 304 stainless steel panel with brushed surface treatment resists prying and corrosion at unattended street level installations
- IP65 rating keeps rain and dust out of parcel locker doors and outdoor payment fronts
- Sleep mode after a period with no key press or data exchange (e.g. 10 seconds) drops draw to 350uA for battery backed cabinets
- Button durability > 2 millions of cycles supports lockers cycled hundreds of times a day
- Communication protocol can be customized so the keypad speaks the format your controller already parses
Application Scenarios
- Parcel and express cabinet doors where couriers enter a pickup code at the panel
- Access control and door entry systems on building entrances
- Self-service payment kiosk terminals
- Vending machines and car wash systems
- Fuel dispensers and parking management terminals
- Banking, medical equipment and outdoor public terminal devices
Who It Is For
- Parcel locker and smart cabinet OEMs
- Kiosk and self-service terminal integrators
- Access control system builders
- Fuel and parking terminal manufacturers
Problems It Solves
- Plastic keypads crack and fade on outdoor lockers; the SUS304 brushed panel and etched characters do not
- A separate LCD adds a second opening to seal, so the 3.5-inch TFT is carried on the same rear mounted panel
- Idle terminals waste power, so the keypad auto-executes Cancel and sleeps at 350uA
- Host software often cannot change, so the interface can be customized to RS485 or I2C instead of RS232
- Visually impaired users cannot read etched digits, so a Braille layout is available
Technical Features
- 16 keys with Cancel to clear all input, Clear to remove the last entered number and Enter to send the password to the backend server for verification
- Caps Lock letter case switching as the default function with other functions customizable
- ASCII and Greek letter extensions supported on the display
- Key travel 0.45mm with 3N+/-0.1N actuation force for a defined press in gloves
- Laser etched characters on SUS304 brushed stainless steel buttons when characters are black
- Operation temperature -20℃~60℃ covers unheated outdoor cabinets
- MTBF >20000 Hour with MTTR <30minutes for planned field service
Specifications
| Keys | 16 |
|---|---|
| Front panel | 155 * 186 millimeters |
| Overall dimensions | 179 * 210 * 37.6 millimeters |
| Display | 3.5-inch TFT display screen |
| Power supply | 5V±5% |
| Working current | peak 65mA / Idle 56mA / sleep 350uA |
| Durability | >2 millions |
| Interface | RS232 |
| Key size | 23*18*5.1mm / 39*18*5.1 |
| Key trip | 0.45mm |
| Operation force | 3N+/-0.1N |
| Operation temperature | -20℃~60℃ |
Materials
- 304 stainless steel panel with brushed surface treatment
- SUS304 brushed stainless steel buttons
Manufacturing Process
- Sheet metal blanking and panel forming of the 304 stainless steel front plate
- CNC machining of the display window and mounting holes
- Brushing of the panel and button surfaces
- Laser etching of key characters, with silk screen etched content set per customer artwork
- Assembly of the 3.5-inch TFT module and rear panel mounting frame
- Sealing and IP65 verification before packing
Quality Control
- Key press endurance sampling against the >2 millions cycle figure
- IP65 water and dust ingress check on the assembled panel
- RS232 communication test across the documented compatible systems
- Current draw measured at peak, idle and sleep states
- Temperature soak at the -20℃~60℃ operating range
Approvals And Test Documentation
- IP65
Customisation Options
- Key layout customizable, including Braille layout
- Silk screen or etching content set to customer artwork
- Interface changed from RS232 to RS485, I2C or other buses
- Communication protocol tailored to the host application
- Key functions such as Caps Lock reassigned
How It Compares
| Plastic membrane locker keypads | The SUS304 brushed panel is explosion-proof and corrosion-resistant where membranes tear and delaminate outdoors |
|---|---|
| Keypad plus separate LCD module | One rear mounted assembly carries both the 16 keys and the 3.5-inch TFT, so only one opening has to be sealed |
| USB only keypads | RS232 as standard with RS485 or I2C customizable suits controllers without a USB host |
Use Guide
- Cut the panel opening for the 179 * 210 * 37.6 millimeters body and fit the keypad from the rear
- Supply 5V±5% and size the rail for the 65mA peak draw
- Wire the RS232 line to the controller and confirm the protocol before first boot
- Send the password to the backend server on Enter and use Cancel to clear all input
- Wipe the brushed panel rather than scouring it to keep the etched characters legible
Questions About This Model
How is the keypad mounted?
It is a rear panel installation, also listed as rare mounting in the mechanical data.
What display does it carry?
A 3.5-inch TFT display screen built into the same panel as the 16 keys.
Can the interface be something other than RS232?
Yes. RS232 is standard and other interfaces such as RS485 or I2C can be customized.
What happens when nobody uses the terminal?
If no key is pressed or no data is exchanged for a period such as 10 seconds, the Cancel command runs automatically and the unit sleeps at 350uA.
Does it support Braille?
Yes, a Braille layout is customizable on the keys.
How long do the keys last?
Button durability is greater than 2 millions cycles, with MTBF >20000 Hour.
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