| Product Parameter | Parameter Description |
| S4A Model | SA-TS21B |
| Product Name | Keyless Access Controller |
| User Capacity | 15000 |
| Operating voltage | DC 12V±10% |
| Operating current | < 100mA |
| Dimensions | 128mm×85mm×22mm |
| Weight | 350g |
| Ambient temperature | -20℃—70℃ |
| Card type (alternative) | EM(ID) card(IC card for options) |
| Card reading distance | 1－15CM |
| NO | Mark | Color | Function |
| 1 | 12V | Red | DC 12V |
| 2 | GND | Black | Power GND |
| 3 | PUSH | Brown | Low level output |
| 4 | OPEN | Purple | Door Release |
| 5 | NO | Blue | Relay NO |
| 6 | COM | Yellow | Public connector |
| 7 | NC | Grey | Relay NC |
| 8 | RST | Pink | Initialization |
| 9 | AL | Light green | Fire control signal |
| 10 | DATA0 | Dark green | None |
| 11 | DATA1 | White | |
| 12 | 485+ | Orange | 485 communicational |
| 13 | 485- | Black & white | (Customization Function) |
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