Model 245 - Opto Isolated Superverter RS-422/RS-485 to RS-232
Source: Telebyte, Inc.
The Model 245 Opto Isolated Superverter is an optically isolated version of the Model 285
The Model 245 Opto Isolated Superverter is an optically isolated version of the Model 285. When operating as an RS-232 to RS-422 interface converter, the Model 245 converts full duplex data, TD and RD, between RS-232 and RS-422.When operating in RS-485, Model 245 has an "intelligent" mode which provides control of the RS-485 line. The Model 245 controls its transmitter data flow in two ways, the use of RTS, pin 4 of the RS-232 port, or turning it on when TD data is applied to the RS-232 port.In the 2 wire mode when no data is received by the RS-232 receiver, the RS-485 receiver is switched ON. When data is detected for transmission the receiver is switched OFF. In the 4 wire mode the RS-485 receiver is constantly ON while the transmitter is switched as required.The Model 245 has a five position dip switch that is used to select the following:
- RS-422 mode - 4 wire
- RS-484 mode - 2 wire or 4 wire
- RS-485 mode - controlled by the RTS or controlled by data 220 Ohm terminator
A DTE/DCE switch reverses pins 2 and 3 of the RS-232 interface. TD and RD LED's on each side of the optical barrier help verify operation.
Both ports of the Model 245 are implemented with DB25 connectors; a male for RS-232 and female for RS-422/RS-485. Four different power options are offered, 110 Volt AC, 60 Hz or 220 VAC, 50 Hz via adapters. For those applications involving a telephone central office the Model 245 can be supplied for operation from -48 Volts DC or 24 Volts DC.
Telebyte, Inc., 270 Pulaski Road, Greenlawn, NY 11740. Tel: 631-423-3232; Fax: 631-423-3267.