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INTRODUCTION (RS232 TO TTL 3.3V
CONVERTER)
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$49.95
Order Here |
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The TTL33-232-1 is an
industrial grade (wide temperature range with surge & static
protection) port-powered bi-directional
RS232 to
TTL 3.3V converter, which can be used to
convert RS-232 to 3.3V TTL/CMOS compatible levels and vice
versa. The unit is powered from the RS-232 data line, and
therefore, no external power or RTS, DTR is required. 
data sheet |
FAQs
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FEATURES (RS232 TO TTL 3.3V
CONVERTER)
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Converts RS232 to TTL 3.3V and vice versa.
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Industrial grade with wide temperature range, surge
and static protection.
- Port-powered, no external power or RTS, DTR
required.
- Plug and play (hot-pluggable, data format auto-sensing and
self-adjusting).
- Built-in
surge protection, static protection and circuit
protection.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified.
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (RS232 TO TTL
3.3V CONVERTER)
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Part Number: |
TTL33-232-1 |
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Compatibility: |
EIA/TIA
RS-232C standard and TTL/CMOS 3.3V level |
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Power Source: |
Port power from RS232 data line |
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Current
Consumption: |
Less than
10mA |
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Baud
Rates: |
300 to 115,200bps (Auto-sensing &
Self-adjusting) |
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Distance: |
RS232 side:
16ft (5m); TTL side: 10ft (3m) |
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Connector: |
RS232 Side:
DB-9 Female; TTL Side: DB-9 Male;
Termination
Board: DB-9 Female and a 3-Way Terminal Block |
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Surge protection: |
600W |
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Static
protection (ESD): |
Up to 15KV |
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Dimensions (H x W x D): |
0.63 x 1.3
x 3.5 in (16 x 32 x 88 mm) (with Termination Board) |
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Weight: |
1.27 oz (36 g)
(with Termination Board) |
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Operating Temperature: |
-40ºF
to 185ºF (-40ºC to 85ºC) |
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Operating Humidity: |
Up to 90% RH (no condensation) |
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TTL SIGNAL LEVELS
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TTL Input |
TTL Output |
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High
(>2.0V) |
High
(>2.4V) |
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Low (<0.8V) |
Low (<0.6V) |
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CONVERTER CONNECTOR / TERMINAL
BLOCK PINOUTS
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RS232 Side |
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Pin |
1 |
4 |
6 |
7 |
8 |
2 |
3 |
5 |
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Signal |
DCD |
DSR |
DTR |
CTS |
RTS |
TX |
RX |
GND |
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Function |
Tied |
Tied |
TX |
RX |
GND |
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 Note:
Some software requires handshake line
acknowledgements. To satisfy the requirements, our
converter's handshake lines are tied together (DCD,
DTR, and DSR tied together, and RTS and CTS tied
together). Therefore, you don't have to modify your
existing software. |
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DB-9
Female (view from front) |
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Terminal Block Side |
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Pin |
1 |
3 |
5 |
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Terminal Block |
TX |
RX |
GND |
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Function |
TTL Out |
TTL In |
GND |
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 Note:
The TTL33-232-1 comes with a 3-way terminal block
for easy wire connections. However, you may choose
not to use the terminal block provided and simply
follow the above table for pin assignments. |
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DB-9 Male (view from front) /
Terminal Block |
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CONNECTIONS (RS232 TO TTL 3.3V
CONVERTER)
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Figure 1:
TTL33-232-1 Connection Diagram |
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TROUBLESHOOTING INSTRUCTIONS
FOR RS232 TTL 3.3V CONVERTER
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1) Port power measurement |
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Note: The port-powered
RS232 TTL 3.3V converter (TTL33-232-1) requires a -7 to
-15VDC on the TX line (Pin 3 on DTE or Pin 2 on DCE) of the
RS232 port to which the converter is connected.
You can connect TTL33-232-1 to
a DTE device which comes with a DB-9 Male connector;
however, if it is a DCE device, you will need to swap Pin 2
and 3 before connecting to the converter. |
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2) Loopback Test |
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- Connect a TTL33-232-1
to your PC's COM port and short TX and RX on the TTL
terminal block (as shown above).
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Run 232Analyzer
FREE version software on your computer.
- Select "ASCII" for
both the Send and Receive data formats. Then send
command and/or string such as "CommFront" from the
232Analyzer software. You should receive an echo of the
command/string sent ("CommFront"). By performing a
simple loopback test like this, you can test both the
transmitter and receiver of the converter. This is very
helpful when you are in doubt about the performance of
your converter.
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Screenshot: Send/receive
commands from 232Analyzer software. |
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232Analyzer is an advanced RS232 Serial Protocol Analyzer
software
that allows you to control, monitor and analyze serial port
(RS232 / RS485 / RS422 / TTL, etc.) activities.
Not just the data,
it also allows you to monitor or change RS-232's line
states: RTS, CTS, DTR, DSR, DCD, and RI.
The FREE version (no time
limitation) can be downloaded from
here.
TECH NOTES
RS-232: 3 easy steps to understand and control
your RS232 devices |
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