RSLink TTL to RS-232 Converter
Last Updated 7 August 2012
This product has been discontinued
For a replacement product, see the RSLink2.
The RSLink converts between typical microcontroller 0-5 volt UART
signals and the true RS-232 signals required to communicate with a
standard PC COM port. On the microcontroller side it connects to
ground, 5V power, and the 0-5 volt receive and transmit lines. The
RS-232 interface is via a female DB-9 connector. It can be
connected to a standard PC COM port with a straight thru extension
- Microcontroller signals: Standard 0-5 volt TTL
levels. Line idle is high, active is low.
- PC signals: Standard RS-232 compatible with PC COM port,
for example. Line idle is low, active is high. Pin 2 is
the transmit line (out from RSLink), pin 3 the receive line (in to
RSLink), and pin 5 is ground. No other pins are
connected. This is directly compatible with a standard PC COM
port. You could plug a RSLink directly into a PC COM port, or
use a "straight thru" extension cable.
- Power: Supplied by microcontroller interface.
Requires 4.5 to 5.5 volts at 15 mA maximum.
- Microcontroller connections: 4 pin locking header, Molex
22-23-2041 or equivalent. Intended to mate with Molex
22-01-3047 or equivalent, available from Jameco as 234819 with pins 234923, or
DigiKey as WM2002-ND with pins
- Speed: 120 kbaud maximum.
- Optional power connection: Two thru-hole pads labeled
"GND" and "5V". These can be used to supply power separately
from the microcontroller interface. If used, only the OUT, GND,
and IN lines of the microcontroller interface need be connected.
- Size: Circuit board is 1.4 x 1.2 inches (36 x 30
mm). Whole unit is 1.6 x 1.2 x 0.6 inches (40 x 30 x 16 mm).
- Temperature: 0-70 degrees Celsius operating range.
- Two layer circuit board with bottom layer ground plane.