This is a user manual for SN-221C decoder. It introduces the features and usage of the decoder.
The SN-221C decoder is a next‑generation device with high reliability, strong protocol adaptability, multiple baud‑rate options, and protective functions for pan‑tilt and lens motors. It uses a PIC microcontroller and supports over 20 standard PTZ protocols as well as special protocols via DIP switches.
The manual explains how to select and adjust pan‑tilt and lens drive voltages, configure RS‑485 communication, choose wiper drive mode, and troubleshoot common issues. Wiring diagrams, jumper settings, and technical specifications are provided to ensure proper installation and operation. This manual is written in Chinese.
| External Power Supply | AC220V (50 Hz) ±10% |
|---|---|
| Transformer Total Power | 23 W (indoor) / 30 W (outdoor) |
| DC12V Camera Power Max Current | 500 mA |
| Pan‑Tilt Drive Voltage | 24 V AC or 220 V AC selectable |
| Lens Drive Voltage | 6 V DC or 12 V DC selectable |
| Lens Drive Current | 100 mA |
| Operating Temperature | 0 °C‑70 °C (indoor), –15 °C‑70 °C (indoor/outdoor), –45 °C‑85 °C (outdoor sealed) |
Use the JP3, JP4, JP5 jumpers on the board: JP5 is common, connect JP4 to set 24 V AC, or connect JP3 to set 220 V AC.
Set the three‑pin jumper T1: connect it to the “6V” side for 6 V DC, or to the “12V” side for 12 V DC.
The communication baud rate can be set to 2400, 4800, or 9600 baud via the DIP switches.