dpc-9600 ABACOM Technologies, Inc, dpc-9600 Datasheet - Page 2

• Manufacturer Part Number: dpc-9600
• Description: 9600bps Serial Data Encoder/decoder Chip
• Manufacturer: ABACOM Technologies, Inc

DPC-9600—Encoding Mode
Detailed Pin Description
Pin 1– +5V Supply
This pin should be decoupled to ground with a
0.1uF capacitor.
Pin 2 – Data Input
Serial data from the transmitting host to be en-
coded and transmitted by the RF transmitter inter-
faced DPC-9600, is input on pin 2. The DPC-9600
expects CMOS/TTL level serial data in the form of
2400bps, logic 0 start bit, 8data bits, no parity and
1 stop bit .
RS232 level Data
Where the transmitting host’s data levels are
RS232, as from a PC for example, an RS-232
level converter should be interfaced between the
host and the DPC-9600 in order to convert the
data into the correct format for the DPC-9600.
The data format required for the DPC-9600 ver-
sion will be 9600bps, a start bit, 8 data bits and 1
stop bit.
In the absence of serial data, pin 2 must be held
in a logic high state.
Note that if pin 2 is not held at the appropriate lev-
els in the absence of data, the DPC-9600 will rec-
ognize this condition as valid data and will errone-
ously process the data since it will recognize this
condition as a valid start bit.
The DPC-9600 is designed for data rates at
9600bps and therefore it is important that the
transmitting and receiving hosts are configured to
send and receive data at 9600bps.
Pin 3—Busy Control Line
9600 is busy passing data received from the host
to its the encoded data output for RF wireless
transmission. This line goes high either when the
DPC-9600 has received its maximum of 8 bytes
or when it has detected the end of incoming data
(under conditions when < 8 bytes have been re-
ceived from the host).
The busy control line goes high when the DPC-
ABACOM Technologies
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The function of the busy line pin 3 is for data flow
control with the host. Implementing the busy line
is necessary in applications where more than 8
bytes are to be transmitted. Under these circum-
stances, the DPC-9600 will receive the first 8
bytes of data, and then use the busy line to signal
the host to pause sending data until it is ready to
receive the next bytes of data.
If the DPC-9600 is connected to the COM port of
a PC for example, the busy line should be con-
nected to the CTS flow control line (pin 8 of the
DB9 connector) via an RS232 level converter
such as the MAX232. The remaining flow control
lines on the DB9 connector can be looped back
on the connector (ie link DSR pin 4 and DTR pin
6). The terminal software interface being used
should have hardware flow control active).
Pin 4– Mode
The mode pin configures the DPC-9600 to oper-
ate as either an encoder or as a decoder.
Connected to Vcc configures the DPC-9600 for
data encoding and connected to ground config-
ures the DPC-9600 for data decoding.
Pin 5– Test
This pin is active low and should be pulled high
via a 10KΩ resistor. When taken low, typically via
a tactile feedback pushbutton switch or any other
dry contact, the data input pin 2 will be ignored
and an 8 byte internal message will be output on
pin 6. The content of this test message will be:
<ABACOM>
The test message is intended for diagnostic pur-
poses and serves as a quick test to verify the in-
tegrity of the RF link. With a receiving host PC
running a simple terminal program such as Hyper-
terminal configured for 9600,8,N,1 the content of
the test message in a correctly configured RF
wireless link will be displayed.