• 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 ports of ±6V to ±12V.
• Supports reading and writing at regular and Overdrive speeds.
• Provides strong pull-up to 5V for Temperature-, Crypto- and EEPROM 1-Wire devices.
• Programs 1-Wire EPROM devices with external 12V power supply.
• Communicates at data rates of 9.6 (default), 19.2, 57.6, and 115.2kbps.
• Standard DB-25 female connector and 6-lead RJ12 connector for easy attachment of standard 1-Wire cables and probes.
The DS9097U-E25# is a RS-232 to 1-Wire adapter, which performs RS-232 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. To write to EPROM devices a external power supply is required. The DS9097U-E25# is based on the DS2480B serial 1-Wire line driver chip and therefore is 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).
The DS9097U-E25# 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 RS-232 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-E25# operates in a byte mode, every data byte received from the RS-232 port generates eight time slots on the 1-Wire line.
Note that there are some COM ports that use signal levels of less than ±5V. The DS9097U-E25# adapter will function in most cases if external power is supplied. Without EPROM programming the external power may be anywhere in the range of 6 to 9V. For EPROM programming the voltage must be at 12V in any case. Before using an externally powered DS9097U-E25# with a COM port of less than ±5V check whether the COM port will not be damaged by 5V on its RXD input.
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