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consuming circuitry of the modem to go into a low power sleep mode if there is no activity.
OPTIONAL LOW CURRENT STANDBY CAPABILITIES -
In addition to the standard power conservation
features described above, several special models are available for applications, such as solar installations,
that have extremely limited power reserves. On these special models, the value of S Register 24 still controls
when the modem will go into low power sleep mode. However, these special models include circuitry that will
allow the modem to completely power down during sleep mode. In this power down sleep mode, the device
will draw approximately 5ma of standby current. When a ring signal is detected on the telephone circuit, the
device will return to an operational state.
OPTIONAL CONTACT CLOSURE FOR CONTROL OF OTHER DEVICES -
Models equipped with the
optional power down sleep mode also include an internal relay with one set of normally open and one set of
normally closed contacts. This relay is rated for a maximum current of 1 ampere and a maximum voltage of
48 volts. When the modem is in an operational state, this relay is energized. When the modem goes into
power down sleep mode, this relay is de-energized. The contacts of the internal relay are available on a 3
pin connector (J6) which is located inside the modem case. With the top of the modem case removed, hold
the modem so that the LEDs are facing to your left and the connectors are facing to your right. The middle
pin of J6 is common, the right pin is normally open during sleep mode and the left pin is normally closed
during sleep mode.
