DS9097U - RS232 1-WIRE HOST ADAPTER 

DS9097U - RS232 1-Wire Host Adapter

Product Code: DS9097U Price: Check Latest The DS9097U 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. 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). 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 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 operates in a byte mode, every data byte received from the RS-232 port generates eight time slots on the 1-Wire line. At 19200bps data rate the DS9097U-E25 is already faster than the DS9097 (E) at 115200bps. Note that there are some COM ports that use signal levels of less than ±5V. The DB-9 versions of this adapter will not work with such ports. The DS9097U-E25 adapter, however, 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. Features 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 ±5V to ±12V (DB-9 version only) or ±6V to ±12V (DB-25 version). 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 (DB-25 version with external 12V power supply only). Communicates at data rates of 9.6 (default), 19.2, 57.6, and 115.2kbps. Standard DB-9 or DB-25 female connector and 6-lead RJ-11 connector for easy attachment of standard 1-Wire cables and probes. Includes DS2502 identification chip (DS9097U-009 only). 1-Wire is a registered trademark of Dallas Semiconductor.