User's Manual

The difference between the text mode and the binary mode does

not matter in the headerless stream mode.

3.3.1.2 Commands for the headerless packet mode

The same command as used in the packet transmission mode can be used, but the

following commands which attempted transmission cannot be used.

TXT, TXR, TBN, TBR, RPT, RTY.

3.3.1.3 Repeater in the headerless packet mode

The repeater also can be used in the headerless stream mode. The repeater address is

set with the memory register or the PAS command. The repeater itself no needs to be

in the headerless stream mode.

Set REG18:bit 5 whether the repeater is used or not. The address of the repeater is set

using REG08 and REG09 or PAS command.

3.4

Power Down Mode

The FDL01TU has three power down modes. Select the mode according to the power

supply operating conditions such as battery powered application.

(1) Active Mode

This mode is not the power down mode but always capable of transmitting and receiving

data. The modem is in the active mode when the power is turned on.

The current consumption is 110 mA maximum in this mode.

(2) RF Block Power Down Mode

This mode shuts down the power supply of the RF circuit block, where only the control

(logic) circuit is activating. Since the control circuit is in operation, the setting of memory

registers are retained. When the modem returns to the Active mode, it can continue its

operation since the register value is retained. Furthermore, functions such as referencing

and setting memory registers can be used in this mode.

This mode is invoked by the following commands.

ROF command: to become the RF block power down mode

RON command: to return to the Active mode

The current consumption is about 35 mA in this mode.