User's Manual

Advanced Information
6 Dust Networks™ LM2610 User’s Guide
3. If the LM2610 times out before the CTS_T
¯¯¯¯¯
becomes active, the LM2610 restores RTS_T
¯¯¯¯¯
to inactive and drops the
packet.
4. If CTS_T
¯¯¯¯¯
is active, the LM2610 transmits the packet.
5. RTS_T
¯¯¯¯¯
is restored to inactive by the LM2610 after the ack_delay timeout has expired.
t
CTS_T to RTS_T
t
RTS_T to CTS_T
TX
0x7EByte 00x7E
t
CTS_T to TX
CTS_T
RTS_T
Figure 1 Packet Transmission from LM2610
Figure 2 illustrates the process that the LM2610 uses to receive serial data:
1. The Customer Premise Equipment (CPE), ensures the interpacket_delay time has passed since the last transmission.
2. The CPE drives RTS_R
¯¯¯¯¯
to active, waits for a falling edge on CTS_R
¯¯¯¯¯
. Timeout is defined as ack_delay, and is long
enough to handle the worst-case response.
3. If the CPE times out before the CTS_R
¯¯¯¯¯
becomes active, the CPE restores RTS_R
¯¯¯¯¯
to inactive and drops the packet.
4. If CTS_R
¯¯¯¯¯
is active, then the CPE transmits the packet.
5. RTS_R
¯¯¯¯¯
is restored to inactive by the CPE after the ack_delay timeout has expired.