DS1411 serial port i button tm holder DS1411 advanced information 020698 1/1 features ? small size, trueground interface to an rs232 com port for reading and writing i button 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 speeds ? 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 ? powered entirely from an rs232 interface ? standard db female connector for mating to the com port of a computer with ds9098 i button retainer for a single i button or microlan cable (ds1402x) rs232 com port rts dtr rxd txd gnd 5v reg. 65 2 7 1 8 4 ds 2480 schematic 33 mm 38 mm 17 mm ordering information DS1411 db9 connector description the DS1411 is a sophisticated rs232 to 1wire tm adapter and i button holder which performs rs232 level conversion and actively generates the 1wire commu- nication signals. together with an adequate tmex soft- ware driver it enables an ibmcompatible pc or laptop computer to directly read all and write any noneprom i button devices. the DS1411 has a ds9098 retainer for a single f5 microcan and can replace the ds9097u09 in applications that use only a single i button. multiple i buttons can be connected using standard microlan cables and button holders (see ds1401 and ds1402x data sheets). 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. since the DS1411 operates in a byte mode, every data byte received from the rs232 port generates eight time slots on the 1wire bus. the DS1411 is based on the ds2480 serial 1wire line driver chip and therefore is not a plugin replacement for the ds1412 serial port adapter. the rxd/ txd polarity select input of the ds2480 is tied to v dd (non inverting).
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