Mission example: prepare and start a new mission, Step 1 – Rainbow Electronics DS2422 User Manual

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DS2422

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STOP MISSION WITH PASSWORD

RST

PD

Select

STP

FFh

FF loop

To verify success, read the General Status Register at address 0215h. If MIP is 0, the command was executed
successfully.

MISSION EXAMPLE: PREPARE AND START A NEW MISSION

Assumption: The previous mission has been ended by using the Stop Mission command. Passwords are not
enabled.

Starting a mission with the DS2422 requires three steps:

Step 1: clear the data of the previous mission
Step 2: write the setup data to register page 1
Step 3: start the mission

STEP 1

Clear the previous mission.

With only a single DS2422 connected to the bus master, the communication of step 1 looks like this:

MASTER MODE

DATA (LSB FIRST)

COMMENTS

TX

(Reset)

Reset pulse

RX

(Presence)

Presence pulse

TX

CCh

Issue “skip ROM” command

TX

96h

Issue “clear memory” command

TX

<8 FFh bytes>

Send dummy password

TX

FFh

Send dummy byte

TX

(Reset)

Reset pulse

RX

(Presence)

Presence pulse