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The MU-1481 converter is intended for converting the RS-232 signal levels to RS-422 or RS-485 signal levels. They can be used in any application requiring asychronous serial communication.

By its design, the converters are suitable for use in industrial applications. The converters are supplied from external source of 10÷30V. Both communication lines are isolated to the power supply and to each other (three-way isolation).

The converters provide the circuits for Automatic Data Flow Control (ADFC) at the RS-422/485 interface. They also provide (like other converters and communication TEDIA PCI cards) overvoltage protection components and user-activatable line termination impedances (both RS-422 and RS-485 interfaces).

The converter MU-1481 is a replacement type for MU-1422 and MU-1485. It provides additional features, such as:


Type MU-1481
Primary line RS-232
Primary line signals TXD, RXD
RTS, DTR (only when ADFC cannot be used)
Secondary line RS-422 or RS-485
Secondary line signals TXD, RXD (RS-422)
TXD/RXD (RS-485)
Secondary line
data transfer control
ADFC, RTS, DTR or ON (line permanently active)
Transfer rate 600Bd÷230.4kBd
Secondary line
surge protection
TVS diodes 5V8/600W
Termination impedance 120Ω/1.3V
(1x at RS-485, 2x at RS-422)
Type of isolation three-way
Isolation voltage 1kVDC
Supply voltage 10÷30VDC
Power consumption 2,2W max.
(90mA @24V, 230mA @10V)
Housing & Dimensions Modulbox 3M
Signal terminals D-Sub 9 connector female (RS-232 signals)
screw terminals, wire 2.5mm2 max.

Note: The Automatic Data Flow Control (ADFC) feature at the secondary line relies on the incoming data at the primary line. If data is detected at primary line when using ADFC, the secondary line is automatically switched on for transmission automatically.