Rainbow-electronics DS1616 Bedienungsanleitung PDF herunterladen (Seite 22)

DS1616

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Communication Reset (Asynchronous Mode)

When transmitting the command, parameters, or data to the DS1616, it is possible that communication

might be interrupted. For example, the user might accidentally disconnect the cable linking the device to

the host computer. To insure that communication always starts at a known state when in the

asynchronous mode, the DS1616 will reset the communication if it senses a problem. This is

accomplished via two methods. First, if during the transmission of a byte of data to the DS1616, the stop

bit is not received, communication will be reset. The lack of a valid stop bit indicates that that particular

byte of data was not received correctly. Second, if more then 10-bit times expire between the reception of

1 byte of data and the reception of the next required byte, then communication will be reset.

Automatic resetting of communication is not required when communicating in the synchronous mode.

This is because of the function of the

RST pin. Pulling RST low resets the serial communication of the

DS1616.

DS1616 COMMANDS

All communication with the DS1616 is accomplished by writing a command to the device followed by

parameter byte/s if required. Table 3 illustrates the commands supported by the DS1616.

The DS1616 commands are summarized below. Note that if an invalid command is issued, no action is

taken by the device.

DS1616 COMMANDS Table 3

COMMAND FUNCTION DESCRIPTION

22h Write Byte Write 1 byte to RTC, Control registers, and User NV RAM

33h Read Page Read Page

44h Specification Test Poll status of temperature and/or ADC Data extremes

55h Read Data Instructs DS1616 to immediately measure the temperature (if

CS0 = 1) and/or perform an analog to digital conversion on the

ADC Channels Selected (if CS[1-3] = 1) and store the result in

the Current Temperature and/or Current ADC Channel [1-3]

A5h Clear Memory This command clears the datalog, histogram, Temperature

Alarm, ADC Channel 1 Alarm, Current Samples, Start Time

Stamp, Start Delay, and Sample Rate registers when the Clear

Enable bit (CLR) in the Control 1 register is set to a 1.

1. Write Byte (22h)

Host Transmit:

D7 D6 D5 D4 D3 D2 D1 D0

00100010

0 a6a5a4a3a2a1a0

d7 d6 d5 d4 d3 d2 d1 d0

DS1616 Response: None

Note that good programming practice insists that the Clear Memory command should be issued whenever

the DS1616 is programmed to begin a new datalogging mission.

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Rainbow-electronics DS1616 Bedienungsanleitung Seite 22