Product manual

XStream‐PKG‐T™TelephoneRFModem–ProductManualv5.x00[2006.02.24]

©2006MaxStream,Inc.,ConfidentialandProprietary 37

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Sleep Modes and Connections

Cyclic sleep can be used with the remote modems to conserve power. ST “Time before Sleep”

Parameter defines how long after a disconnect a remote will stay awake. A modem is not allowed

to enter sleep mode when it is engaged in a connection. A modem will wake as defined by SM

parameter and check for an RF message. If a message is detected, the modem will stay awake

only if the message is a connect message from the base for this modem. DI3 (pin 2) wake-up can

be used to wake a remote modem. Usually the connection on DI3 should also be enabled so that

a connection is established on wake-up.

NOTE: The ST (Time Before Sleep) time must be set long enough to account for the time it could take

to make a connection if several remote modems get a connection before a remote’s ST times out.

Pin sleep can also be used with a remote modem. A modem will not be allowed into pin sleep

while a connection is active. Usually the connection on DI3 (DR = 4) should also be enabled so

that a connection is established on wakeup. Pin wake-up could also be used to scan for a

connection at an interval not defined by the cyclic sleep modes.

I/O Passing and Connections

I/O lines can be passed between a remote and base modem by enabling I/O line passing (see the

RT, DR, CD, CO, CS, BK, BO commands). When a connection is not active, the output lines on the

base and remote modems will be in their default state. When a connection is established, the

base and remote output line will be set to reflect the corresponding input lines.

Monitoring Connections

The DO3 pin (RX LED) can be used to show when a connection is active on both remote and base

modems. This is the default condition. This line will be asserted (high) during a connection and

de-asserted (low) when there is no connection.

A base modem can also be set to send the “CONNECT XXXX” string (where “XXXX” is the

connecting modem’s MY (Source Address) parameter) anytime a connection is established. Refer

to CM (Connection Message) Command.