rf803d-alpha-sot rfsolutions.ltd, rf803d-alpha-sot Datasheet - Page 11

• Manufacturer Part Number: rf803d-alpha-sot
• Description: Alpha Encoder / Decoder Ic?s Rf803-alpha Easy To Use Telemetry System Using Alpha Modules
• Manufacturer: rfsolutions.ltd

D
D
S
S
8
8
0
0
3
3
-
-
A
A
L
L
P
P
H
H
A
A
-
-
1
1
ALPHA Encoder / Decoder IC’s
N
N
o
o
Continuous Transmit or State change transmit
The RF803E-ALPHA can be set to transmit only on a state change – when it will send 3 data
packets each time it receives a state change on its inputs – or to transmit continuously while an
input is active. This enables the RF803E-ALPHA to be used in applications with momentary
inputs or latching inputs.
NOTE: TRX acknowledge can only be sent AFTER a transmission. Therefore when using TRX
mode and Continuous Transmit mode an acknowledge is send when the transmission has
finished. When using TRX mode and State Change Transmit the acknowledgement is sent
500ms after the first packet is received by the RF803D-ALPHA.
Serial Data Output
The RF803D-ALPHA has a serial data output. This outputs the serial number, button and
battery status of the transmitter encoder (RF803E-ALPHA). This data may be fed directly to a
microcontroller or RS232 type driver circuit which may then be fed directly to a PC serial port.
Serial data is output initially and again every ½ second whilst data is being received from the
RF803E-ALPHA transmitter. i.e. this output is valid regardless of whether the RF803E-ALPHA
encoder has been learnt to the RF803D-ALPHA decoder or not. The serial data packet
contains a learn bit to show if an encoder input is learnt.
Serial Data Format
Serial Data is sent every 1/2 second as a stream of 7 bytes at 9.6K baud. The serial data format
is: 8 data bits with 1 stop bit, no parity.
Serial data is output form the Decoder chip whenever a valid data packet from an RF80n or
other compatible RF Solutions transmitter is received regardless of learn
Encoder Serial Number [NN]: made up of two 8-bit bytes where the most significant byte is
transmitted first.
This provides a total of 65,536 possible serial numbers.
Example:
v
v
‘
‘
0
0
9
9
12AB (hexadecimal) or 0001 0010 1010 1011 (binary)
N
N
©
©
2
2
X
0
0
T
T
0
0
e
8
8
e
l
l
R
R
0
0
F
F
1
1
X
2
2
S
S
7
7
o
o
3
3
l
l
STAT $0D $0A
u
u
8
8
t
t
9
9
i
i
o
o
8
8
n
n
0
0
Output from Serial Data pin
s
s
0
0
L
0
0
L
t
t
d
d
F
F
,
,
a
a
w
w
x
x
w
w
0
0
1
w
w
1
2
2
.
.
r
r
7
7
f
f
s
3
s
3
o
o
4
4
l
l
u
u
8
8
t
t
7 bytes of data transmitted
0
0
i
i
o
o
6
6
n
n
6
6
s
s
1
1
LF Line feed (last character)
CR Carriage return
Battery Status / Learn Status
Encoder Input information
Encoder serial number
.
.
c
c
o
o
.
.
u
u
k
k
P
P
a
a
g
g
e
e
1
1
1
1
RF803-ALPHA