Recover From Low Power Mode By Command (Uart); Figure 26: Recovery Example Using Commands - Opticon MDI-4000 Series Serial Interface Manual

5.4.2

Recover from Low Power Mode by Command (UART)

You can use a command to recover from low power mode.
Recover from Low Power Mode by Command
1. To start the recovery process, send dummy data, such as a NULL character.
2. Wait until the RTS or POWERDWN signal becomes low. (This should happen within
30 ms.)
3. To start reading, send the trigger command "Z".
4. If you need to send additional commands, confirm that the RTS or POWERDOWN signal
is low.
RTS (*1)
High
or
POWERDWN Low
RxD
Wave form
State
Low Power
Cannot be used when Handshaking is set to MODEM, because the RTS signal is "High."
*1
*2
The MDI-4x00 and MDI-4x50 have different in recovery times: MDI-4x00 = 18 ms, MDI-4x50 = 41 ms.

Figure 26: Recovery Example Using Commands

Command acceptable
Trigger command "Z" etc
Recovery command "Null" etc
*2
I
LOW
Recovery
MDI-4000 Series Serial Interface Manual
10 ms -
I
OP
I
STD
Read
* Confitured
I
LOW
Standby Low Power
45