iButton® Specialist and Manufacturer of Dallas Keys

DS9097U-009 Universal 1-Wire™ COM Port Adapter with Serial


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DS9097U-009 Universal 1-Wire™ COM Port Adapter with Serial #

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. It 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. The RXD/TXD Polarity Select input of the DS2480B is tied to VDD (non inverting). Free software drivers can be downloaded from the Dallas iButton Web Site.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 9600bps. Under software control, the adapter can be set up for RS232 data rates of 19200, 57600, and 115200bps. The two higher rates are recommended 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. Note that there are some COM ports that use signal levels of less than plus or minus 5V and this adapter will not work with such ports.


True-Ground Interface to an RS232 COM Port for Reading and Writing 1-Wire® Devices
Works with Bipolar as well as Unipolar Logic Signals
Compatible to COM port of (±)5V to (±)12V
Supports Reading and Writing at Regular and Overdrive Speeds
Provides Strong Pullup to 5V for Temperature-,Crypto-, and EEPROM 1-Wire® devices
Standard DB-9 Connector and 6-lead RJ-11 Connector for Easy Attachment of Standard 1-Wire® Cables and Probes
Includes DS2502 Identification Chip (DS9097U-009 only)