RC11xx(HP)-TM
RC25xx(HP)-TM
RC17xx(HP)-TM
2016 Radiocrafts AS
RC11xx(HP)/25xx(HP)/17xx(HP)-TM Data Sheet rev. 1.48 Page 43 of 86
2016 Tiny Mesh AS
Radiocrafts
Embedded Wireless Solutions
UART Receive and CTS Timing
Symbol
Value
Description / Note
t
RXD
Min 521 us
Number of bytes in message x 521 us
t
Packet_Timeout
min 0, max 255 ms
Configurable 10-2550 ms. No time out if buffer is filled (120 bytes).
t
RXD_TX
2 - 32 ms
Time from serial data received on UART until packet ready to be transmitted,
including LBT and random MAC timing
t
TX
4.3-16.8 ms
Time to transmit packet, including preamble and sync.
Transmit time = 4.3ms + number of bytes* 0.104ms
t
TX_RX
2 - 32 ms
Time from RF packet transmitted until Acknowledge preamble detected. Time
equals t
RX_ACK
in Receiver RF Packet timing diagram
t
RX(ACK)
3.2 ms- 16.8 ms
Time to receive and verify Acknowledge packet
Router: 3.2 ms, Gateway 4.3-16.8 ms, depending on packet size.
t
RXD_CTS
10 us
Time from buffer full or time-out, until CTS high
t
CTS
9.5- 82 m
s
Time from CTS Off until Acknowledge received=
t
RXD_TX
+ t
TX
+ t
TX_RX
+ t
RX(ACK)
- t
RXD_CTS
t
CTS_Hold
min 10, max 2550 ms
Time from Acknowledge received until CTS low
CTS HOLD TIME parameter. Not applicable for Router Devices
Note: Timing diagram representative for packet transmission without collision and retry, and no wait for
clear channel delay.
Examples:
120 bytes serial data entered on Router UART @ 19.2 kbit/s, RF rate=76,8 kbit/s
Time from first start bit enters UART until packet delivered and CTS released (on):
min: (120 x 0.521) + 0 + 2 + 16.8 + 2 + 3.2 = 86.5 ms
max: (120 x 0.521) + 0 + 32 + 16.8 + 32 + 3.2 = 146.5 ms
10 bytes serial data entered on Router UART @ 19.2 kbit/s, RF rate=76,8 kbit/s, packet time-out = 10
ms. Time from first start bit enters UART until packet delivered and CTS released (on):
min: (10 x 0.521) + 10 + 2 + 5.3 + 2 + 3.2 = 27.7 ms
max: (10 x 0.521) + 10 + 32 + 5.3 + 32 + 3.2 = 87.7 ms
10 bytes serial data entered on Gateway UART @ 19.2 kbit/s, RF rate 76,8 kbit/s, packet time-out = 10
ms, CTS_Hold = 10ms. Time from first start bit enters UART until packet delivered and CTS released
(on):
min: (10 x 0.521) + 10 + 2 + 5.3 + 2 + 5.3 + 10 = 39.8 ms
max: (10 x 0.521) + 10 + 32 + 5.3 + 32 + 5.3 + 10= 99.8 ms