ttl33 232 1
Industrial Port-Powered RS232/TTL 3.3V Converter
Part Number: TTL33-232-1
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Industrial Port-Powered RS-232 TTL 3.3V Converter
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(Part Number: TTL33-232-1)
Revision: 3.1
www.CommFront.com
INTRODUCTION
The TTL33-232-1 is a compact, rugged, industrial grade, port-powered RS-232 to
3.3VDC TTL converter, which can be used to convert RS-232 to 3.3VDC TTL
compatible levels and vice versa. This product operates within a temperature
range of -40ºF to 185ºF (-40ºC to 85ºC), and features 600W surge protection and
15kV static protection. The unit is efficiently powered from the RS-232 data line,
and the full-duplex RS-232 to full-duplex TTL conversion eliminates the need of
auto-turnaround feature. This RS232 to TTL converter also comes with
the auto-sensing and self-adjusting features, which automatically adjust baud rate,
parity, stop bit and other COM port parameters to the devices that they are
connected to. Therefore, it requires no external power or software drivers, making
the unit a highly reliable and truly plug-and-play device.
FEATURES
• Port-powered, no external power is required.
• Operates reliably from 300 to 115,200 baud.
• Industrial grade enclosed in a rugged, rustless ABS housing.
• Plug and play (hot-pluggable, data format auto-sensing and self-adjusting).
• Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
• Built-in 600W surge protection, 15kV static protection and circuit protection.
• Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
• Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
• 5-year manufacturer’s warranty.
SPECIFICATIONS
Compatibility:
Power Source:
Current Consumption:
Baud Rates:
Distance:
Connectors:
Surge Protection:
Static Protection (ESD):
Dimensions (H x W x
D):
Weight:
Operating Temperature:
Operating Humidity:
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Communications made easy
Revision: 3.1
EIA/TIA RS-232C standard and TTL 3.3VDC level
Port power from RS-232 data line
Less than 10mA
300 to 115,200bps (auto-sensing and self-adjusting)
RS-232 side: 16ft (5m); TTL side: 10ft (3m)
RS-232 side: DB-9 Female; TTL side: DB-9 Male;
Termination Board: DB-9 Female and a 3-Way Terminal
Block
600W
Up to 15KV
0.63 x 1.3 x 3.5 in (16 x 32 x 88 mm)
(with termination board)
1.27 oz (36 g) (with termination board)
-40ºF to 185ºF (-40ºC to 85ºC)
Up to 90% RH (no condensation)
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Page 2 of 4
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PIN ASSIGNMENT
RS-232 Side (DB-9 Female Connector):
Pin:
1
4
6
Signal:
DCD
DSR
DTR
Function:
tied together
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7
8
CTS
RTS
tied together
2
TX
TX
3
RX
RX
5
GND
GND
Note: Some software requires handshake
line acknowledgements. To satisfy the
requirements, the TTL33-232-1's handshake
lines (RS232 side) are tied together
(DCD, DSR, and DTR tied together, CTS
and RTS tied together). Therefore, you
don't have to modify your existing software.
TROUBLESHOOTING
Perform a loopback test by using CommFront’s 232Analyzer software: Connect TX
(TTL Out) to RX (TTL In), and then send commands from the 232Analyzer software.
You should receive an echo of the commands sent. By performing a simple
loopback test like this, you can test both the transmitter and receiver of the
RS-232/TTL converter. This is very helpful when you are in doubt about the
performance of your converter.
TTL Side (DB-9 Male Connector / Terminal Block):
DB-9 Pin:
1
3
5
Terminal Block:
TX
RX
GND
Function:
TTL OUT
TTL IN
GND
• The numbers on the left indicate
the pin assignment of DB-9 male
connector (TTL side).
• TX is the TTL Output, RX is the
TTL Input.
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CONNECTIONS
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TTL SIGNAL LEVELS
TTL Input
High (>2.0V)
Low (<0.8V)
Revision: 3.1
TTL Output
High (3.3V)
Low (0.0V)
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Page 3 of 4
Revision: 3.1
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Page 4 of 4
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