Implementing Sleep Mode - GE MDS SD Series Technical Manual
Secure, long range ip/ethernet & serial wireless transceiver
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NOTE The COM1 operating mode may also be set using a PC terminal connected directly to
the port. See SD Serial/Telnet Management Supplement, Part No. 05-6193A01 for de-
tails.
8.4 Implementing Sleep Mode
Sleep Mode places the transceiver into a low power "hibernating" state, with a nominal current
draw of less than 12 mA (at 13 VDC) and a "wake-up" time of approximately 50 milliseconds.
Sleep Mode is often used at battery/solar-powered sites to conserve power.
The ability to enter Sleep Mode is controlled through the
tings" on Page 43), but an active low on Pin 4 of the
in Sleep Mode.
NOTE Sleep mode is not intended for use on a Master radio.
How Sleep Mode Works
When Sleep Mode is enabled via the Device Settings Screen, the state of Pin 4 on
tinuously monitored to detect a request to enter sleep mode from an external device (RTU, PLC,
etc.). For ease of use, there are certain conditions which temporarily override the sleep request to
prevent unwanted behavior of the radio. These conditions are:
1. The radio must be powered up for at least 60 seconds before it is allowed to enter sleep
mode.
2. Any user-originated activity on the console terminal disables entering sleep mode for 30
seconds, measured from the time of last keystroke.
3. When locally reprogramming the transceiver's firmware, sleep mode is disabled throughout
the reprogramming time, and is suppressed for 30 seconds thereafter.
4. The passage of payload data does not inhibit sleep mode.
Sleep Mode Example
This section describes how to implement Sleep Mode in a typical scenario. Before using Sleep
Mode, the following conditions must be met to provide proper operation and avoid damage to the
:
transceiver
a. Sleep Mode must be enabled on the
b. Output voltage to the radio must not exceed
c. Output voltage to wake up the radio must be between
d. Output voltage to enter Sleep Mode must be
With the above conditions met, you are ready to use Sleep Mode. As a working example, sup-
pose you need communication to each Remote site in your network only once per hour. Program
the RTU/PLC at the Remote sites to raise an RS-232 line once each hour (DTR for example),
and wait for a poll and response before lowering it again. Connect the RS-232 line to Pin 4 of the
radio's
port. This allows each Remote to be polled once per hour with a significant savings
COM2
in power consumption.
MDS 05-4864A01, Rev. I
Device Settings
port is what actually places the radio
COM2
>>
Radio
Device Settings
.
+5.0 VDC
+2.0 VDC
or less.
+0.6 VDC
SD Series Technical Manual
Screen (see "Device Set-
COM2
Screen.
and
.
+5.0 VDC
is con-
95
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