The CVT-485_422-1 is a compact, rugged, industrial-grade, port-powered, bi-directional RS232 to RS485 / RS232 to RS422 converter, which can be used to convert any standard unbalanced RS-232C port into a two-wire half-duplex balanced RS485 port, or a four-wire full-duplex balanced RS485 / RS422 port and vice versa.

This industrial-grade RS232 to RS422 / RS485 converter operates within a wide temperature range (-40F to 185F / -40C to 85C), features 600W surge protection and 15kV static protection, and comes with a built-in 120 Ohm terminator for system reliability and easy installation. The unit is powered from the RS232 data line; it also supports data direction auto-turnaround, which automatically enables the RS485 transceiver when data is present on the RS232 side. Therefore, it requires no external power, software drivers or flow control, making the unit a rugged, highly reliable, and truly plug-and-play device.

Baud rates: 300 to 115.2K Baud.

FEATURES

RS232 to RS422/485 Converter data sheet

- Converts RS232 to 2-wire RS485, 4-wire RS485 or 4-wire RS422 and vice versa.
- 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
- Built-in 120Ω end-of-line terminator for system reliability and easy installation.
- Industrial grade with wide temperature range (-40F to 185F / -40C to 85C), surge (600W) and static protection (15kV).
- No drivers needed.
- Port-powered, no external power or RTS, DTR required.
- Accepts external 5VDC regulated power if the port-power is insufficient.
- Plug and play (hot-pluggable, data format auto-sensing & self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in surge protection, static protection and circuit protection.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified: strictly certified by world-class lab TUV.
- 5-year manufacturer's warranty.

120 Ohm End-of-Line Terminator (Built-in)

Self-explanatory, the 120 Ohm end-of-line terminator is to be connected at the end of the RS485/RS422 transmission line. This is important for building a reliable RS485/RS422 system, not only because of impedance matching, but also for the reduction of signal reflections and noise problems.

Note: The 120 Ohm end-of-line terminator adds heavy DC loading to a system and, therefore, it should be connected only when the RS485/RS422's distance is over 660ft (200m).