11/01/05

12

ES51981

3 1/2 AUTO DMM

single package

0

p 1

P

0V

-3V

LSB

MSB

D0 ~D6

One data block consists of 11 packets, or 110 bits. The following figure shows the

format of a data block. The range packet indicates the full scale range of the meter.

Digit 3 through digit 0 are just the digits on the LCD panel. The function packet

indicates the measurement mode of the meter. Status, option 1 and option 2 give the

status of the meter. CR and LF are delimiters used to separate the blocks.

All package

0

p 1

status

digit2

digit3

function

range

option1

CR

LF

digit0

digit1

0

p 1 0

p 1

0

p 1 0

p 1 0

p 1

0

p 1 0

p 1 0

p 1

0

p 1 0

p 1

option2

The meter always outputs the current input value to the serial port in spite of HOLD

mode. Each block is repeated twice in one conversion cycle. The detailed data format of

each packet is listed below.