DK251 optical isolation interface converter is a product compatible with RS-232C, RS-422, RS-485 standards, can convert single-ended RS-232 signal to balanced differential RS-422 or RS-485 signal, built-in optical isolation, can provide 3500V isolation voltage, fast transient voltage suppressor(TVS) can effectively suppress lightning(Lightning) and ESD, can effectively prevent lightning and common-ground interference.
The DK251 optical isolation interface converter complies with RS-232C, RS-422 and RS-485 standards. It converts single‑ended RS‑232 signals to balanced differential RS‑422/RS‑485 signals, provides 3500 V isolation, and includes TVS protection against lightning and ESD. The RS‑232 side uses a DB25 female connector, while the RS‑422/RS‑485 side uses four‑pin terminal blocks, allowing point‑to‑point or point‑to‑multi‑point connections up to 32 devices with data rates from 0 to 115.2 kbps.
The manual covers performance parameters, installation steps, wiring diagrams, and troubleshooting. It details the switch settings for RS‑232→RS‑422 or RS‑232→RS‑485 conversion, power requirements (9 V input), operating temperature (-25 °C to 70 °C), dimensions (12 mm × 54 mm × 25 mm), and protection levels (1 kV ESD on RS‑232, 600 W surge per line on RS‑422/RS‑485). Fault diagnosis procedures include checking connector connections, power supply, and switch position. This manual is written in Chinese.
| Interface compatibility | RS-232C, RS-422, RS-485 |
|---|---|
| Isolation voltage | 3500 V |
| Data rate | 0 – 115.2 Kbps |
| Maximum devices (multi‑drop) | 32 |
| Dimensions | 12 mm × 54 mm × 25 mm |
| Operating temperature | -25 °C to 70 °C |
| ESD protection (RS‑232) | 1 kV |
| Surge protection (RS‑422/RS‑485) | 600 W per line |
Set the DK251 interface converter switch to the RS‑422 position.
The DK251 can connect up to 32 RS‑422 or RS‑485 devices in a point‑to‑multi‑point configuration.