ds9097u09 universal 1wire tm com port adapter ds9097u09 072898 1/1 features ? trueground interface to an rs232 com port for reading and writing i button tm devices ? works with bipolar logic signals of 5v to 12v (rs232c) as well as unipolar signals of 5v to 12v ? supports reading and writing at regular and overdrive speed ? provides strong pullup to 5v for temperature i button, crypto i button and eeprom i button ? communicates at data rates of 9.6k (default), 19.2k, 57.6k and 115.2k bits/s ? adapter is powered entirely from an rs232 interface ? standard db9 female connector for mating to the com port of a computer and 6lead rj11 connector for easy attachment of standard microlan cables and probes ? includes ds2502 idchip (ds9097u009 only) n.c. 6 n. c. 5 1wire data 4 1wire gnd 3 n.c. 2 n. c. 1 rs232 com port rts dtr rxd txd gnd 5v reg. 65 2 7 1 8 4 ds 2480 rj11 pin 1 schematic id ordering information ds9097u009 db9 connector ds9097us09 like ds9097u09, but no id chip description the ds9097u09 is a sophisticated rs232 to 1wire adapter which performs rs232 level conversion and actively generates the 1wire communication signals. together with an adequate tmex software driver it enables an ibmcompatible pc to directly read all and write any noneprom i button devices connected to the adapter. 1wire communication is supported by the adapter for regular 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 recommended for communication at overdrive speed with overdrive capable devices connected to the 1wire bus. since the ds9097u09 operates in a byte mode, every data byte received from the rs232 port generates eight time slots on the 1wire bus. at 19200 bits/s data rate the ds9097u09 is already faster than the ds9097(e) at 115200 bits/s. the ds9097u09 is based on the ds2480 serial 1wire line driver chip and therefore is not a plugin replacement for the ds9097 or ds9097e . the rxd/ txd polarity select input of the ds2480 is tied to vdd (noninverting).
|
