User's Manual

Page 140 FRH-SD07TU/TB Manual

Figure 7–9: Wakeup using RLU command

7.3.3.2 Wak e up t hrough repea t er : RLR c om m a nd

Transmit command

Use the RLR command to wakeup the modem in the ULTRA mode, through the repeater.

Command format : ＠RLR[repeater address] [destination address]CR/LF

[repeater address] designates the repeater to transmit the wakeup request.

[destination address] designate the station address (the set value of REG00) to be waken-up.

Broadcasting wakeup (address 255) is also available. On accepting this command, the

modem returns “P1” response and starts transmitting wakeup transmission request

packet to the repeater. And this packet makes the repeater to transmit the wakeup

request packet to the destination(s).

The transmission of wakeup request packet

The sender station transmits the wakeup transmission request to the repeater, its request

making the repeater to transmit the wakeup request packet to the destination(s). The

wakeup transmission request is repeated to transmit at the cycle of 200 ms by the

retransmission count designated by REG11 or RNO command.

At the repeater, the destination address checking function set by REG18:bit 0 is valid.

Accordingly, when the function is set to be valid, the repeater does not receive the wakeup

transmission request unless the repeater address matches.

When the repeater receives the wakeup transmission request, it transmits the wakeup

request packet to the destination station designated by [destination address] for 160 ms

duration. Though ACK packet is returned from the destination station, the repeater

ignores it and does not return ACK packet to the sender station. Therefore, even when the

single station is designated by the [destination address], the sender station cannot confirm

whether the destination station wakes-up or not. It is necessary to issue TXR command (to

attempt communication) and such to the destination station, for to confirm whether

response is obtained or not from the destination station.

Wake-u

acke

ACK

Rev. 050415-01.1