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Model:
TTL-485-2
$42.95
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The TTL-485-2 is a compact, rugged,
industrial-grade,
bi-directional
RS485 to TTL converter,
which can be used to convert RS485 to 5VDC TTL-compatible
levels and vice versa.
This
industrial RS485 to TTL converter
operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC),
features 600W surge protection and 15kV static protection,
and comes with
a built-in 120-Ohm terminator
for system reliability and easy installation.
The unit is powered from an external 5VDC
regulated power supply (included); it supports data direction auto-turnaround,
which automatically enables the RS485 transceiver when data
is present on the TTL side. Therefore, it requires no
software drivers or flow control, making the unit a highly reliable and truly plug-and-play device.
The built-in 120-Ohm
terminator can be turned ON or OFF through a simple jumper
setting, thus making the unit an ideal solution for all
types of
installations.
The unit is backed by our 30-day risk-free money-back
guarantee and 5-year replacement warranty.
A separate external 5VDC regulated power supply is included
in the package.
Baud
rates: 300 to 115.2K Baud.
datasheet |  FAQs |
product selection guide
 rs485/rs422 application note
 testing
info |
 declaration
of conformity
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PRODUCT PHOTOS |
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FEATURES |
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Converts RS485 to TTL 5V and vice versa.
- 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
- Built-in 120Ω end-of-line terminator for system reliability and
easy installation.
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Industrial grade with temperature range of -40ºF to 185ºF (-40ºC to 85ºC),
surge (600W)
and static protection (15kV).
- External 5V powered.
- No drivers needed.
- Plug and play (Hot-pluggable, Data format Auto-sensing &
Self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in
surge protection, static protection and circuit
protection.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
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Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
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5-year
manufacturer's warranty. |
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SPECIFICATIONS
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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
(5.0V) |
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Low (<0.8V) |
Low (0.0V) |
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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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120 OHM END-OF-LINE JUMPER
SETTINGS |
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Important: Turn ON
Jumper 120 (120 Ohm End-Of-Line Terminator) at both ends of
the RS-485 bus when the data rate is over 19.2kbps or the distance is over 660ft (200m). |
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CONNECTIONS
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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
RS485 TO TTL 5V CONVERTER
1) External 5VDC power input
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.
2) Loopback Test
- 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.
Screenshot 1: Send commands
from 1st instance of the 232Analyzer software.
Screenshot 2: Receive commands
from 2nd instance of the 232Analyzer software.
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
RS-485/RS422:
Building a reliable RS485/RS422 network |
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