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CommFront offers
a range of high-quality, industrial-grade, port or
external-powered
RS485 to TTL converter and RS232 / RS422 to TTL converter products. These
plug-and-play converter products operate within a
wide temperature range (-40ºF
to 185ºF / -40ºC to 85ºC),
feature 600W surge protection and 15kV static protection, and come with
built-in 120 Ohm terminators for easy installation. Whether
your environment is commercial or industrial, our TTL converter products provide safe, easy, and cost-effective solutions for your
data-conversion
applications. |
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RS485 TO TTL CONVERTER / RS232 RS422 TTL CONVERTER
SELECTION TABLE
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Part
Number |
Description |
Price |
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TTL-232-1 |
RS232 <=> TTL 5V
Converter
(Industrial / Port-powered / 300 to 115.2K Baud) |
$39.95
Order |
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TTL33-232-1 |
RS232 <=> TTL 3.3V Converter
(Industrial / Port-powered / 300 to 115.2K Baud) |
$39.95
Order |
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TTL-485-2 |
TTL 5V <=> 2-wire RS485
Converter
(Industrial / External-powered /300 to 115.2K Baud) |
$49.95
Order |
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TTL-485_422-2 |
TTL 5V <=> 2-wire RS485 or
4-wire RS485/RS422 Converter
(Industrial / External-powered / 300 to 115.2K Baud) |
$59.95
Order |
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INTRODUCTION (RS485 TO TTL
CONVERTER)
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$54.95
Order Here |
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The TTL-485-2 is an
industrial
grade (wide temperature range with surge & static
protection) bi-directional
RS485 to TTL converter,
which can be used to convert RS485 to 5VDC TTL-compatible
levels and vice versa. It is also ideal for extending the
TTL distance. The unit is powered from an external 5VDC
power supply. It supports data direction auto-turnaround,
and therefore, no flow control is required.
data sheet |
FAQs |
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FEATURES (RS485 TO TTL
CONVERTER)
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- Converts RS485 to TTL 5V and vice
versa.
- Extend half-duplex TTL distance.
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Industrial grade with wide temperature range, surge
and static protection.
- Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in Terminating Resistor (120Ω).
- Built-in
surge protection, static protection and circuit
protection.
- Built-in 120Ω end-of-line terminator
for easy installation.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified.
-
5-year
manufacturer's warranty. |
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SPECIFICATIONS (RS485 TO TTL
CONVERTER)
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Part Number:
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TTL-485-2 |
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Compatibility: |
EIA/TIA
RS-485 standard and TTL level |
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Power Source: |
+5VDC (±5%)
Regulated Power Supply (not included) |
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Current
Consumption: |
Less than
30mA |
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Baud
Rates: |
300
to 115,200bps (Auto-sensing & Self-adjusting) |
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Distance: |
RS485 side: Up
to 4000ft (1.2km) at 19,200bps;
TTL side: 10ft (3m) |
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Connector: |
TTL Side: DB-9
Male; RS485 Side: DB-9 Male;
Termination Board (TTL): DB-9 Female and a 3-way Terminal Block;
Termination
Board
(RS485): DB-9 Female and a 4-Way Terminal Block |
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Maximum number
of drops: |
128 |
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End of Line
Terminator: |
120Ω
(Built-in) |
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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 4.5 in (16 x 32 x 115 mm) (with
Termination Boards) |
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Weight: |
1.66 oz (47
g) (with Termination Boards) |
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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
(>3.5V) |
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Low (<0.8V) |
Low (<0.6V) |
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CONVERTER CONNECTOR / TERMINAL
BLOCK PINOUTS
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TTL
Side |
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Pin |
1 |
3 |
5 |
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Signal |
TX |
RX |
GND |
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Function |
TTL Out |
TTL In |
GND |
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 Note:
The TTL side 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
Female (view from front) / Terminal Block |
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RS485 Side |
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Pin |
1 |
3 |
5 |
6,7 |
9 |
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Terminal Block |
A+ |
B- |
GND |
+5V |
+5V |
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Function |
RS485+ |
RS485- |
GND |
Terminate/remove Jumper 120 to turn ON/OFF
the 120Ω
end-of-line terminator. |
+5V input |
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 Note:
The RS485 side comes with a 4-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 (RS485 TO TTL
CONVERTER / TTL EXTENDER)
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Figure 1: Master-Slave
Multi-Drop Connections |
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Figure 2: Extending
TTL Distance (Half-Duplex) |
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TROUBLESHOOTING INSTRUCTIONS
FOR RS485
TTL CONVERTER
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1) External 5VDC power input |
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CAUTION: Be sure that the
DC power applied to pin +5V and GND is within the range
of +4.75V to +5.25V (5V ±5%). Excessive input voltage or
incorrect polarity connection could damage the
converter.
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2) Loopback Test |
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- Connect two numbers of
TTL-485-2 to your PC’s RS-485 COM ports and short TX and
RX (TX to RX and RX to TX) on the TTL terminal blocks
(as shown above).
- Run two instances of
the 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 one COM
port. You should receive an echo of the command/string
sent ("CommFront") on the other COM port. 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 1: Send commands
from 1st instance of the 232Analyzer software.
Screenshot 2: Receive commands
from 2nd instance of the 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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