Decagon Devices GS3 Manual - Halaman 6

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GS3 Integrator Guide

SDI-12 TIMING

SDI-12 communication sends characters at 1200 bits per second. Each character has 1 start bit, 7 data

bits (LSB first), 1 even parity bit, and 1 stop bit (Active low or inverted logic levels):

All SDI-12 commands and response must adhere to the following format on the data line. Both the

command and response are preceded by an address and terminated by a carriage return line feed

combination.

DATA LOGGER

Break

(at least 12ms)

(at least 8.33)

*MAXIMUM TIME

380 mS

Most Commands

780 mS

For a D command after a concurrent measurement

810 mS

For a D command after a concurrent measurement, with CRC

START

Example SDI-12 transmission of the character '1' (0x31)

Command

Marking

ms)

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or call us at 1.509.332.5600 between 7AM to 5PM PST

(at least 8.33)

Sensor must respond

within 15 ms

STOP

SENSOR

Response

Marking

ms)

Maximum time*

R34