User's Manual

T90-DTU User Manual
12
04H
Read/W
rite
REG1
7，6： sub-packing setting
00：240byte （Default）
01：128byte
10：64byte
11：32byte
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5 ：enable RSSI environmental noise
1：on
0：off（Default）
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4，3，2 remain
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1，0： TX power
00：22dbm（Default）
01：17dbm
10：13dbm
11：10dbm
 When the data is smaller than the sub packet
length, the serial output of the receiving end is
an uninterrupted continuous output.
When the data is larger than the sub packet
length, the receiving end serial port will output
the sub packet.
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 When enabled, the C0 C1 C2 C3 command can
be sent in the transmitting mode or WOR
transmitting mode to read the register.
Register 0x00: Current ambient noise rssi
Register 0X01: rssi when the data was received
last time.
（Current channel noise is: dBm =-RSSI/2）
Command format: C0 C1 C2 C3 + starting
address + read length
Returns: C1 + address address + read length + read
valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi
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 Power and current are nonlinear, and power
efficiency is highest at maximum power.
 The current does not decrease in proportion to
the decrease in power.
05H
Read/W
rite
REG2
Channel （CH）
0-80 stands for 81 channel respectively
 Actual frequency= 920+ CH *1M
06H
Read/W
rite
REG3
7 enable RSSI byte
1：on
0：off（Default）
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6， fixed transmission
1：fixed transmission
0：transparent transmission（Default）
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5 enable repeater
1：on
0：off
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4 enable LBT（listen before transmit）
1：on
0：off（Default）
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3 WOR TX and RX control
1：WOR transmitter
TX and RX are enabled, certain preamble
code is added when transmitting date. Data receiving
is on.
0：WOR receiver（Default）
Transmission is unavailable. Module works
in WOR monitoring, (see details about WOR time
below) to save power.
 When enabled, the module receives wireless
data and it will follow an RSSI strength byte
after output via the serial port TXD
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 The module recognizes the first three bytes of
the serial data as: address high + address low +
channel and takes it as the wireless transmitting
target.
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 After the reply function is enabled, if the target
address is not the module itself, the module will
forward it once.
 In order to prevent data return-back, it is
recommended to use it in conjunction with the
fixed point mode. That is: the target address is
different from the source address.
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 When enabled, wireless data will be monitored
before it is transmitted, which can avoid
interference to a certain extent, but may cause
data delay.
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 Only valid in Mode 1.
 After the WOR receiver receives the wireless
data and outputs it through the serial port, it
will wait for 1000ms before entering the WOR
again. Users can input the serial port data and
return it via the wireless during this period.
Each serial byte will be refreshed for 1000ms.