dpc-64-ctl ABACOM Technologies, Inc, dpc-64-ctl Datasheet - Page 3

• Manufacturer Part Number: dpc-64-ctl
• Description: Intelligent Rf Transceiver Module
• Manufacturer: ABACOM Technologies, Inc

host).
The function of the busy line pin 17 is for data
flow control with the host. Implementing the busy
line is necessary in applications where more than
64 bytes are to be transmitted. Under these cir-
cumstances, the DPC-64-CTL transceiver module
will receive the first 64 bytes of data, and then use
the busy line to signal the host to pause sending
further data until it is has completed its data proc-
essing functions and transmitted the data.
If the designers application does not require send-
ing more than 64 bytes of data, then the busy
control pin 16 may be left unconnected.
Pin 18– Data Input
Data to be transmitted over DPC-64-CTL RF link
is fed into pin 18 in standard serial CMOS/TTL
level data format of 9600bps, 8 data bits, No par-
ity and one stop bit (9600,8,N,1). One to 64 bytes
may be transmitted at a time without the need for
the flow control as is implemented with the BUSY
pin 17.
The DPC64-CTL transparently formats the data
into the correct protocol for RF communications
and then transmits the data received from the
host.
Test Circuit (Two required to test a link)
ABACOM Technologies, Inc.
0.1uF
470
5V
12
14
19
17
16
13
22
1
DPC-64-CTL
VDD
SD
TP
BUSY
TXD
GND
RSSI
GND
AUDIO
TEST
GND
RXD
ANT
CLK
CD
DR
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10
9
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ANT
When keying the TEST switch, the DPC-64-
CTL will transmit its 64 byte preset test mes-
sage to the receiving DPC-64-CTL test circuit.
The test transmission will continue for as long
as the test button is keyed.
The LED flashing at the receiving end serves
as confirmation that the 64 byte message has
been received, error free.
When the host is not sending data to the DPC-64-
CTL transceiver module, it is important that pin 18
is held high. If it is held low, the DPC-64-CTL will
see this condition as valid data entering on pin 18
and will begin to transmit this erroneous data.
Pin 19– Reserved
Leave pin 19 unconnected. This pin is reserved
for production purposes.
Pin 21– Antenna
A simple λ/4 whip antenna may be connected
close to this pin. If a coaxial cable fed antenna is
used, the core of the coax must be connect close
to this pin, with the shield connected to the adja-
cent ground pins 20 or 22.
To calculate the physical length of a λ/4 antenna:
λ/4 = 71.6÷f meters
Where f = frequency (MHz)
= 234÷f feet