MEMO DRIVEs

   For the use of MEMO CARDs in µP-bus circuitry, MEMO DRIVEs components offer direct connectivity, small physical dimensions, and simple installation.

   The function of the MEMO DRIVE is similar to that of a disc drive. Connected to the microprocessor, the MEMO DRIVE provides an interface for a portable memory medium, the MEMO CARD.   The MEMO DRIVE is the electrical interface between the host system and the memory card as well as the physical guide for inserting and positioning it.
 

Compact design; simple installation

Simple instruction set

Commands equal for all cards

Direct connectivity to all µP-bus systems

„Hot plugging“ allowed

5V only power supply

Secure data transmission

Power driver allows for great tolerance in positioning

Bumps and vibrations do not harm read/write functions

Industrial Temperature Specification

      The main difference between a disc drive and the MEMO DRIVE is the later's fully electronic design. Neither the MEMO DRIVE nor the MEMO CARD have any moving parts.    The MEMO DRIVE serves as a guide for inserting and positioning the MEMO CARD. Unlike diskettes or PCMCIA cards, the MEMO DRIVE experiences no positioning problems. It is not sensitive to vibrations, nor does it require an energy consuming motor.

DRIVE TYPES

   MEMO DRIVE PAR ( - parallel µP-bus interface for direct connectivity to all common processing systems. Connection is comparable to a µP peripheral like a PIO component. Data, address and control lines handle data transfer.

   MEMO DRIVE MIN - functions are identical to MEMO DRIVE PAR but using a handshake protocol for connection to a serial RS232 port. Models are available for µP-bus connectivity using a TTL line or for connection to a standard serial port using a RS232 line for communication. Baud rates between 9600 and 115200 can be adjusted through jumper settings.

 

BUFFER RAM

   All DRIVE versions are available with an optional 32 KB buffer RAM. The host system can load data through direct access or write commands directly to this RAM. Data is automatically written onto the card from the buffer RAM, leaving the host system free for other important tasks.

DATA TRANSMISSION

   Data and commands are inductively transmitted between the DRIVE and the MEMO CARD. Here too, an automatic telegram protocol provides optimal data security.

  A data batch consists of a start signal, a command code, the number of bytes, the bytes of data, a check sum, and an end signal. A command telegram, an answering telegram, or an error message is also used for data transmission between the DRIVE and the CARD.

  When the MEMO CARD receives data, a checksum is computed and compared with the value transmitted with the data. If an error in transmission is detected, the MEMO CARD automatically requests retransmission.

 

COMMUNICATION

   In order to provide the utmost in data security with easy handling, the MEMO DRIVE uses a command response and verification telegram-type protocol to communicate with the host system.

  The terminal must send a specific request to the MEMO DRIVE. The MEMO DRIVE responds with a confirmation telegram only if this request is correct and complete and the request telegram has been recognized correctly.

 

DATA SECURITY

   Disturbances Field strengths of 10V/m (EN 50 082) cannot disrupt the coupled field of a MEMO CARD.

   Transmission Errors Errors in transmissions are effectively prevented by using check sums.

   Unauthorized Write Process Due to the complex structure of a data batch, all of which is protected by a check sum, an accidental, unauthorized write process due to external fields, whether intentionally or unintentionally attempted, is impossible.

   Loss of Power Uncontrolled power loss during the write process may result in incomplete data, but never results in uncontrolled access to a random address or randomly writing data to an incorrect address.

ELECTRIC PARAMETER

PHYSICAL DIMENSIONS
MOUNTING FRAME

	q 69,00 mm s 64,50 mm t 13,00 mm u 9,85 mm v 5,10 mm w 56,00 mm x 13,00 mm y 12,35 mm
	h 65,0 mm i 28,0 mm k 2,0 mm m 17,5 mm n 5,0 mm o 40,0 mm p 85,0 mm r 1,0 mm g1 24,5 mm g2 11,5 mm g3 12,0 mm

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