Version 05/08
Please note:
- Pins 1 to 8 carry RS232-conform levels
- Pin 10 is the mutual ground (GND)
- Supply v5V from USB port (max. 100mA!)
- Pin 9 must be used for microcontrollers requiring a %v level on the RX input.
- Pin 15 to pin 20 are I/Os, the RXD detects voltages from 3.3V to 5V, TXD emits a level of 3.3V.
If controllers with 5V are applied, you have to use the connection TXD_5V.
- If the RS232-conform level is required on pins 1 to 8, you have to make a connection between
pin 14 (SUSPEND_3V) and pin 13 (ENABLE).
- Via pin 12/14 (SUSPEND_3V/SUSPEND_5V), you can tell the external hardware (e.g.
microcontroller) whether a USB connection was established. These pins are on high-level
when the USB connection is detected!
Installation/assembly
• The converter can be equipped with a SubD plug and a 4-pole USB connection cable (+5V=,
Data+, Data-, GND) as well as plugged into a corresponding socket on another circuit board
via pin strips.
When soldering on the 9-pole SubD plug, check the right alignment of the plug
on the circuit board (4 resp. 5 contact strips on the circuit board and on the
socket).
When connecting a USB connection cable, make sure that the cable connections are
established correctly. In case of wrong polarity, not only the converter is destroyed but also
the corresponding USB port. Loss of warranty/guarantee!
• If you do not need the small circuit board part for the 9-pole SubD plug, carefully snap it off
at the predetermined breaking point.
• Solder in the enclosed pin strips for installation in a plug-type socket. Make sure that the
soldering process is as short as possible to prevent overheating of the circuit board and the
other elements. Observe all usual safety instructions when soldering.
The pin strips must be soldered on at the bottom of the circuit board so that the
elements are located on the other (top) side.
Software installation
First install the enclosed driver software!
Then connect the converter with the USB port.
Technical data:
Supply voltage: ................................................................... +5V DC
Max. power consumption (depending on baud rate): ....... approx. 100mA
Admissible ambient temperature range: ........................... 0°C to +70°C
Admissible relative ambient air humidity: .......................... 20-60% (non-condensing)
Dimensions: ........................................................................ 33*16*13mm
Disposal
Dispose of the product at the end of its serviceable life in accordance with the
current statutory requirements; e. g. return it to any suitable collecting point.
O P E R A T I N G I N S T R U C T I O N S
www.conrad.com
RS232 USB Converter
Item no. 19 72 57
For information about regular updates in the Internet, see:
http://www.c-control-support.net
Intended Use
This product serves to connect a device with an RS232/UART interface to a USB port (USB1.1
or USB2.0).
The converter can convert interfaces with RS232 level, TTL level (5V) and 3.3Volt level to
USB.
The circuit board of the converter is soldered in directly or via a socket strip. It is also possible
to solder on a 9-pole SubD plug (e.g. Conrad order no. 742066) and attach a USB cable to
the other end of the circuit board (+5V=, Data+, Data-, GND).
If you do not solder on a 9-pole SubD plug, it is possible to break off the corresponding part
of the circuit board at a predetermined breaking point to save space on the own application.
This product complies with the applicable National and European specifications. All names of
companies and products are trademarks of the respective owner. All rights reserved.
Contents
• RS232 USB converter
• Pin strips
• CD with driver
• Operating instructions
Safety instructions
In case of damage incurred by disregarding this instruction manual, the
warranty claim is void. Liability for any and all consequential damage is
excluded!
Nor do we assume liability for damage to property or personal injury,
caused by improper use or failure to observe the safety instructions. The
warranty is voided in these cases.
• For safety reasons, any unauthorized conversion and/or modification to the product are not
permitted.
• The product is not a toy and must be kept out of the reach of children.
• The product must not get damp or wet.
• Do not leave packaging material laying around carelessly. These may become dangerous
playing material for children.
Pin assignment
Pin assignment/name
1 = XRXD
2 = XCTS
3 = XDSR
4 = XDCD
5 = XRI
6 = XTXD
7 = XRTS
8 = XDTR
9 = TXD_5V
10 = GND
Pin assignment/name
11 = RS232_UB
12 = SUSPEND_5V
13 = ENABLE
14 = SUSPEND_3V
15 = CTS
16 = TXD
17 = DSR
18 = RXD
19 = DTR
20 = RTS
Pin assignment/name
USB_Vcc = supply voltage via USB, +5V=
Data-
= Data line for USB
Data+
= Data line for USB
These operating instructions are published by Conrad Electronic SE, Klaus-Conrad-
Straße 1, D-92240 Hirschau/Germany.
These operating instructions reflect the current technical specifications at time of
print. We reserve the right to change the technical or physical specifiations.
© 2008 by Conrad Electronic SE.
