RSLink2 Logic level to RS-232 Converter
Last Updated 18 Dec 2014
The RSLink2 converts between typical microcontroller logic level 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, power, and the logic level 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
The RSLink2 works with 3.3 and 5 volt systems, whereas the RSLink is only for 5 volt systems.
Over the counter sales
These units are
available from Electronics
Plus at 480 King Street, Littleton MA 01460.
Embed does not sell individual units directly. Individual
units can be purchased over the counter (see above), or from MicrochipDirect, product ID
Packs of 5 units, $69/pack ($13.80 each)
For shipping to the United States. A flat fee of
$8.00 will be charged for shipping and handling the first 5-pack, and
$2.00 each additional 5-pack in the same order.
For shipping to all other destinations. A flat fee of
$25.00 will be charged for shipping and handling the first 5-pack, and
$3.00 for each additional 5-pack in the same order.
- Microcontroller signals: Ground to power logic
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 RSLink2), pin 3 the receive line (in to
RSLink2), and pin 5 is ground. The RTS line is looped back to CTS
(pin 7 connected to pin 8). No other pins are connected.
The pinout is directly compatible with a standard PC COM port. You
could plug a RSLink2 directly into a PC COM port, or use a "straight
thru" extension cable.
- Power: Supplied by microcontroller interface.
Requires 3.0 to 5.5 volts at 15mA maximum.
- Microcontroller connections: 4 pin locking header,
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: 250Kbits/second maximum.
- Size: Circuit board is 1.35 x 1.2 inches (34 x 30
mm). Whole unit is 1.6 x 1.2 x 0.6 inches (41 x 30 x 16
- Temperature: 0-70 degrees Celsius operating range.
- Two layer circuit board with bottom layer ground plane.