Detailed Product Description

tm card,

TM1990A SPECIAL FEATURES

l       TM1990A is full compatible with DS1990A, DS1990R and i1990A

l       Unique 48bit serial number

l       Low-cost electronic key for access control

l       8-bit CRC for checking data integrity

l       Can be read in less than 5 ms

l       Operating temperature range of -40 to  +85

COMMON INFORMATION BUTTON FEATURES

l       Unique, factory-lasered and tested 64-bit

registration number (8-bit family code + 48-

bit serial number + 8-bit CRC tester) assures

absolute traceability because no two parts are

alike.

l       Multidrop controller for MicroLAN.

l       Digital identification by momentary contact.

l       Chip-based data carrier compactly stores information.

l       Data can be accessed while affixed to an object.

l       Economically communicates to bus master with a single digital signal at 16.3k bits per second.

l       Standard 16 mm diameter and 1-Wire protocol ensure compatibility with INFORMATION BUTTON family.

l       Button shape is self-aligning with cupshaped probes.

l       Durable stainless steel case engraved with registration number withstands harsh environments.

l       Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim.

l       Presence detector acknowledges when reader first applies voltage.