DSPC01

Revision 1.21

Page

of 8

April. 2014

6

12. For temperature and altitude, the highest bit will show it is positive or negative. When the

highest bit is 1, the value is negative. The other bit show the actual value. For example, for altitude,

when the data got is 0x80111c, the actual altitude is : -438.0m.

Wake up command:

Start + 0x20 + ACK_from _module + 0x70 + ACK_from_module + stop

Delay 1s

Sleep command

Start + 0x20 + ACK_from _module + 0x71 + ACK_from_module + stop

Delay 100ms

Read altitude command

Start + 0x20 + ACK_from _module + 0xa0 + ACK_from_module + stop

Delay 200ms

Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + ACK_from_master + Data3 +

NACK_from_master + Stop

Delay 10ms

Read pressure command

Start + 0x20 + ACK_from _module + 0xb0 + ACK_from_module + stop

Delay 200ms

Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + ACK_from_master + Data3 +

NACK_from_master + Stop

Delay 10ms

Read weather forecast command

Start + 0x20 + ACK_from _module + 0xb3 + ACK_from_module + stop

Delay 200ms

Start + 0x21 + ACK_from _module + Data1 + NACK_from_master + Stop

Delay 10ms

Read Compass command

Start + 0x20 + ACK_from _module + 0xc0 + ACK_from_module + stop

Delay 200ms

Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + NACK_from_master + Stop

Delay 10ms

Read Temperature command

Start + 0x20 + ACK_from _module + 0x80 + ACK_from_module + stop

Delay 200ms

Start + 0x21 + ACK_from _module + Data1 + ACK_from_master + Data2 + NACK_from_master

+ Stop

Delay 10ms