Universal 1-Wire COM Port Adapter

The DS9097U is a sophisticated RS232 to 1-Wire Adapter, which performs RS232 level conversion and actively generates the 1-Wire Communication signals. Together with an adequate TMEX software driver it enables an IBM-compatible PC to directly communicate with any 1-Wire device connected to the adapter's RJ-11 port. The DB-9 version reads and writes any non-EPROM 1-Wire device. To write to EPROM devices the DB-25 version with external power supply is required. All DS9097U adapters are based on the DS2480B Serial 1-Wire Line Driver chip and therefore are not a plug-in replacement for the DS9097 or DS9097E. The RXD/TXD Polarity Select input of the DS2480B is tied to Vdd (non-inverting). Free software drivers CAN be downloaded from http://www.ibutton.com/software/tmex/index.html. The DS9097U communicates with 1-Wire devices at regular speed as well as Overdrive speed. The serial port must support a data transmission rate of 9600 bits/s. Under software control, the adapter CAN be set up for RS232 data rates of 19200, 57600 and 115200 bits per second. The two higher rates are rec- ommended for Communication at Overdrive speed with Overdrive capable devices. Since the DS9097U operates in a byte mode, every data byte received from the RS232 port generates eight time slots on the 1-Wire line. At 19200 bits/s data rate the DS9097U-E25 is already faster than the DS9097 (E) at 115200 bits/s. By Maxim Integrated Products
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