Vaisala WINDCAP WMT52 Guía de usuario descargar pdf (Pagina 134)

User’s Guide ______________________________________________________________________

132 __________________________________________________________________M210925EN-B

- After receiving the break and the command, the addressed sensor

sets the data line to marking at 8.33 milliseconds and then sends the

response (tolerance: -0.40 milliseconds.) The start bit of the first

response byte must start within 15 milliseconds after the stop bit of

the last byte of the command (tolerance: +0.40 milliseconds).

- After a sensor transmits the last character of a response, it must

relinquish control of the data line within 7.5 milliseconds

(tolerance: +0.40 milliseconds.)

- No more than 1.66 milliseconds of marking are allowed between

the end of the stop bit and the start bit (for example between

characters) on any characters in the command or the response (no

tolerance.) This permits a response to an M command to be sent

within a 380-millisecond window.

- Sensors must return to a low-power standby mode after receiving

an invalid address or after detecting a marking state on the data line

for 100 milliseconds (tolerance: +0.40 milliseconds).

- When a recorder addresses a different sensor, or if the data line has

been in the marking state for more than 87 milliseconds, the next

command must be preceded by a break.

NOTE

The low-power standby mode, in addition to being a low-power

consumption state, is a protocol state and a break is required to leave

that state.

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Vaisala WINDCAP WMT52 Guía de usuario Pagina 134