ssrt-09-rs232 ABACOM Technologies, Inc, ssrt-09-rs232 Datasheet - Page 3

• Manufacturer Part Number: ssrt-09-rs232
• Description: Spread Spectrum Rf Data Transceivers
• Manufacturer: ABACOM Technologies, Inc

Connection to 5V TTL/CMOS Hosts
Connecting the SSRT-x9-RS232 transceivers to 5V level devices (or 3V level devices) such as microcontrollers is
easily achieved through an RS232 level converter interface such as the MAX 232 or the MAX 3232 level converters.
For basic operation, only a three wire interface comprising of TXD, RXD and GND is required between the SSRT-
x9-RS232 and the host microcontroller serial port. (refer to the pin assignment table on the previous page for the
SSRT-x9-RS232 pin-outs with the relevant pins being 2,3 and 5)
Note: A special RS232-to-TTL adapter cable (part # W232) which contains an RS232
Power Supply Connection
The SSRT-x9-RS232 transceivers require a linear DC power supply (such as a wall adapter) that delivers a voltage
in the range from a 7V-15V DC and a current of at least 300mA. The DC socket of the SSRT-x9-RS232 is polarized
where the 2.1mm center pin is positive. The SSRT-x9-RS232 transceivers do not have a separate power ON/OFF
switch since power is easily applied or removed through plugging-in or unplugging the power jack.
Data Rate Configuration
The SSRT-x9-RS232 transceiver’s data rates are fixed at either 9600 bits per second or 19200 bits per second de-
pending on the model. The host’s data rate should be configured for the same data rate as the SSRT-x9-RS232
transceiver and this will allow for continuous data transmission without the need for flow control. Data is always re-
ceived and transmitted at the serial port as a start bit, 8 data bits and a stop bit. This allows for the following data
configurations to be sent:
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ABACOM Technologies, Inc.
8-bit, no parity, 1 stop bit
7-bit, even parity, 1 stop bit
7-bit, odd aprity, 1 stop bit
7-bit, no parity, 2 stop bits
level converter circuit built into the DB9 connector at the one end and a 10 pin
IDC socket at the other end is available . Using the W232 cable eliminates the
overhead of having to build your own level conversion.
microcontroller
host
•
383 Bering Ave • Etobicoke • ON • M8Z 3B1 • Tel +![phone] • Fax [phone]
300mA
12Vdc
RS232 level
converter
www.abacom-tech.com
SSRT-x9-RS232
W232 RS232-to-TTL
adapter cable