AS3900 datasheet(35/59 Pages) AMSCO

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AS3900

Data Sheet - Detail ed Description

Figure 24. Pairing Clients via Longscan

Table 29. Scan / Reconnect / Pair Clients

Step

Master

Client

The Master opens the LNA Receive Window for 1s via the

command SCAN. This Window can be prolonged by setting

bit longscan in REG 0x03<6>. The timers for the Clients need

to be enabled via the REG 0x01<7:0>.

The Client timer is enabled via the REG 0x01<0> and continuously

send packets based on its time base. The communication error

counter need to be disabled, otherwise the Client timer would stop.

The Client transmit one packet 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 started (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

the dedicated time (datarate x 3byte). If ACK was received the

interrupt ack_rtx is generated and the transmit command is

terminated.

RECEIVE

TRANSMIT

longscan set

TRANSMIT

CLIENT1

CLIENT2

CLIENT8

MASTER

TRANSMIT

REC

TRANSMIT

REC

ack_rtx

wrong_id

ack_rtx

wrong_id

ack_rtx

wrong_id

scan_end

nak_rtx

ack_rtx

nak_rtx

ack_rtx

nak_rtx

ack_rtx

AS3900 Datasheet(PDF) 35 Page - ams AG

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