User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

Receive Mode

(cont.)

The module will remain in Receive Mode until an error is detected in the

received data, or data is no longer transmitted, at which point, the module

transitions to Idle Mode. If serial data was stored in the data buffer while the

module was in Receive Mode, the data will be transmitted after the module

returns to Idle Mode.

Sleep Mode

Sleep Mode enables the 9XStream module to go into a low-power state in

which minimal power is consumed when the module is not in use. Once in

Sleep Mode, the module will not transmit or receive data until it first returns

to Idle Mode. To enter Sleep Mode, the module must be inactive (no data

transmission or reception) for a user-defined period of time (specified by the

ST command). After this time elapses, the module transitions to Sleep

Mode. By default, Sleep Mode is disabled and must be enabled using the

SM command.

The 9XStream features several Sleep Mode settings, each of which makes

use of different mechanisms to enter or leave Sleep Mode. The table in

Appendix H lists the various Sleep Mode settings and the requirements to

transition to and from Sleep Mode for each setting.

Pin Sleep (SM=1)

After enabling the Pin Sleep setting, the Sleep pin (Pin 2) controls whether

the 9XStream is active or in Sleep Mode. If Sleep is de-asserted, the module

is fully operational. Once Sleep is asserted, the module transitions to Sleep

Mode and remains in its lowest power consuming state until the Sleep pin is

de-asserted. The 9XStream requires 85 ms to transition from Sleep Mode to

Idle Mode. The Sleep pin is only active if the module is set up to operate in

this mode; otherwise the pin is ignored. (See the SM command in the

9XStream Commands Table (Appendix E), for more information.) Once

in Pin Sleep Mode, the CTS pin (Pin 1) is de-asserted (high) to indicate that

data should not be sent to the module during this time. The TX/PWR pin

(Pin 8) is also de-asserted (low) when the module is in Pin Sleep Mode.

Serial Port Sleep (SM=2)

If this state is enabled, the module goes into Sleep Mode after a user-defined

period of inactivity (no transmitting or receiving of data). This period of

time can be changed by modifying the ST command. When the module is in

Serial Port Sleep Mode, the TX/PWR pin (Pin 8) is de-asserted (low). The

module will return to Idle Mode once a character is received on the DI pin.