Rainbow-electronics DS2422 Manuale Utente Scaricare il pdf (Pagina 47)

DS2422

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STEP 2

During the setup, the device needs to learn the following information:

§ Time and Date

§ Sample Rate

§ Alarm Thresholds

§ Alarm Controls (Response to Conditional Search)

§ General Mission Parameters (e. g., channels to log and logging format, rollover, start mode)

§ Mission Start Delay

The following data will setup the DS2422 for a mission that logs temperature using 8-bit format. Such a mission

could last up to 56 days until the 8192-byte datalog memory is full.

ADDRESS DATA EXAMPLE VALUES FUNCTION

0200h 00h

0201h 30h 15:30:00 hours Time

0202h 15h

0203h 01h

0204h 04h 1

of April in 2002 Date

0205h 02h

0206h 0Ah

0207h 00h

Every 10 minutes (EHSS = 0) Sample rate

0208h 52h 0°C low Temperature Alarm

0209h 66h 10°C high Threshold

020Ah 00h External Data Alarm

020Bh FFh

(Don’t care)

Threshold

020Ch FFh

020Dh FFh

020Eh FFh

020Fh FFh

(Don’t care) Clock through read-only registers

0210h 02h Enable high alarm Temp. Alarm Control

0211h FCh Disabled Data Alarm Control

0212h 01h On (enabled), EHSS = 0 (low sample rate)

RTC Oscillator Control, sample

rate selection

0213h C1h Normal start; no rollover; 8-bit temp. log General Mission Control

0214h FFh Clock through

0215h FFh

(Don’t care)

read-only registers

0216h 5Ah

0217h 00h 90 minutes Mission Start Delay

0218h 00h

With only a single DS2422 connected to the bus master, the communication of step 2 looks like this:

MASTER MODE DATA (LSB FIRST) COMMENTS

TX (Reset) Reset pulse

RX (Presence) Presence pulse

TX CCh Issue “skip ROM” command

TX 0Fh Issue “write scratchpad” command

TX 00h TA1, beginning offset=00h

TX 02h TA2, address=0200h

TX <25 data bytes> Write 25 bytes of data to scratchpad

1 2 ... 42 43 44 45 46 47 48

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Rainbow-electronics DS2422 Manuale Utente Pagina 47

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