sdi-12
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| — | sdi-12 [2024/04/15 12:47] (current) – created river | ||
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| + | ====== SDI-12 ====== | ||
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| + | SDI-12 is a serial data standard used for measurement instruments, | ||
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| + | [[http:// | ||
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| + | * One data wire plus 12V power and ground. | ||
| + | * Power 12V nom, (9.6V to 16V) | ||
| + | * 1200 baud | ||
| + | * 5 V signal. | ||
| + | * Max 0.5A sensor draw. | ||
| + | * Mark 0V (-0.5 to 1.0V) | ||
| + | * Space 5V (3.5 to 5.5V) | ||
| + | * I think it idles low (0V, logic 1). | ||
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| + | * 1 start bit | ||
| + | * 7 data bits, least significant bit transmitted first | ||
| + | * 1 parity bit, even parity | ||
| + | * 1 stop bit | ||
| + | * Printable ASCII. | ||
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| + | Sensors only speak when spoken to by a data recorder. | ||
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| + | ===== Protocol ===== | ||
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| + | - Starts at 0V. | ||
| + | - " | ||
| + | - low (mark) >= 8.33mS | ||
| + | - address / command / data. | ||
sdi-12.txt · Last modified: by river