AS3900 datasheet(29/59 Pages) AMSCO

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AS3900

Data Sheet - Detail ed Description

Table 25. Pairing Communication

Step

Master

Client

All Timers are disabled at the Master via the REG

0x01<7:0>. The Master starts the Wakeup procedure as

described.

When the wakeup call is finished the Master switches

automatically the FSK receiver on for 1sec. During this

listening time, the Clients transmit randomly their first data.

After the MCU defined delay time expires, the Client starts the first

transmission via the command TRANSMIT.

Master verifies the received client ID by comparing it to its ID

list REG 0x08-0x1F. If the ID was found, the internal timing

system for this Client is updated (immediately after the ID is

received) with the cycl_time and random pointer rndpt,

received from the Client. If the CRC is correct, the ACK is

sent back to signal the Client that it has been accepted.

Interrupt dat_rtx is set and the MCU could read the data.

After the data is transmitted, the Client enters the receive mode for a

dedicated time waiting for the ACK pattern. If ACK was received the

interrupt ack_rtx is generated and the transmit command is

terminated. Client goes to Standby Mode until the next wakeup cycle

event, because all timers are disabled for the pairing procedure.

If the received ID is correct but CRC error occurs, no ACK

will be sent and the timer for this client is not started because

no information for cycle time and RNG-pointer is available.

If the received ID can not be found in ID list REG 0x08 to

0x1F and the reception was successful (CRC is O.K.) the

interrupt wrong_id is set, but no ACK is sent to the client. The

MCU reads the ID from the id_new register REG 0x34 to

0x36. If the ID is confirmed (by MCU) then the MCU writes

the new ID via SDI to the ID list REG 0x08 to 0x1F and the

Client is accepted at the next wake up call.

If the received ID is not confirmed by the MCU, no ACK is

sent to the Client even if the Client tries to connect again.

If the received ID belongs to a client that has already an

activated data transmission, nothing is changed.

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If the client do not receive an ACK (within the dedicated time slot), the

transmit command is not terminated. If no ACK is received the

receiver is switched of and the interrupt rxend is generated. The Client

MCU can then repeat the TRANSMIT command after a certain delay.

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