EY-40
Connect TTL UART Serial interface to USB-TTL debugger
| PIN | Description | Pull LOW | Pull HIGH |
|---|---|---|---|
| SEL | Mode Select | AT Commands | Data Transmission Mode |
| CS | Chip Select Mode | Wakeup Mode | Sleep Mode * |
| TXD | Data TX | - | - |
| RXD | Data RX | - | - |
Connect TTL UART Serial interface to USB-TTL debugger
| PIN | Description | Pull LOW | Pull HIGH |
|---|---|---|---|
| SEL | Mode Select | AT Commands | Data Transmission Mode |
| CS | Chip Select Mode | Wakeup Mode | Sleep Mode * |
| TXD | Data TX | - | - |
| RXD | Data RX | - | - |