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CommFront offers
2 models of high-quality, industrial-grade, port or
external-powered
RS232 Repeater / RS485 Repeater / RS422 Repeater products. These plug-and-play
products operate within a
wide temperature range (-40ºF
to 185ºF / -40ºC to 85ºC),
feature 600W surge protection and 15kV static protection. Whether
your environment is commercial or industrial, "clean" or "noisy"*, our
RS232 / RS422 / RS485 Repeater products provide safe, easy, and cost-effective solutions for your
data-communication
applications.
* A "noisy" environment
is an area
surrounded by ground loops, transient surges
and spikes, which could potentially harm your expensive
equipment such as computers and data communication
devices.
The CommFront opto-isolated repeaters provide
simple and effective ways to protect your devices from such
potential harms. |
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RS232 REPEATER / RS485
REPEATER / RS422 REPEATER
SELECTION TABLE
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Part
Number |
Description |
Price |
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RPT-232-3 |
RS232
Repeater
(Isolated/Industrial/Port-powered/300 to 28.8K Baud) |
$34.95
Order |
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RPT-485_422-2 |
RS485/RS422
Repeater/Converter
(Industrial/External-powered/300 to 115.2K Baud) |
$69.95
Order |
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INTRODUCTION (INDUSTRIAL RS485
RS422 REPEATER / EXTENDER / BOOSTER / CONVERTER)
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$79.95
Order Here |
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The RPT-485_422-2 is
an industrial grade (wide temperature range
with surge & static protection) bi-directional
RS-485 repeater / RS-422 repeater, which can be used to extend the RS-485
or RS-422 distance to up to 4000 ft (1.2km). It can also be
used to convert a two-wire RS-485 signal into a four-wire
RS-422 signal, and vice versa.
This
product features data direction auto-turnaround. Therefore,
no flow control is required.
data sheet |
FAQs
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FEATURES (INDUSTRIAL RS485 RS422
REPEATER / EXTENDER / BOOSTER)
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Extends RS485 or RS422 distance to another 4000 ft (1.2km).
- Can also be used to convert 2-wire RS485 to 4-wire RS422 and vice
versa.
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Industrial grade with wide temperature range, surge
and static protection.
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Data direction auto-turnaround, no flow control is
required.
- Plug and play (hot-pluggable, data format auto-sensing and
self-adjusting).
- Built-in
surge protection, static protection and circuit
protection.
- Built-in 120Ω end-of-line terminator.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified.
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (INDUSTRIAL RS485
RS422 REPEATER / EXTENDER)
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Part Number: |
RPT-485_422-2 |
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Compatibility: |
EIA/TIA
RS-485 and RS-422 standard |
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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 and
self-adjusting) |
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Distance: |
Up
to 4000ft (1.2km) at 19,200bps |
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Connector: |
2x DB-9 Male
Connectors; 2x Termination Boards: DB-9 Female
and a 6-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 4.6 in (16 x 32 x 118 mm) (with termination boards) |
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Weight: |
2.0 oz (57
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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REPEATER CONNECTOR / TERMINAL
BLOCK PINOUTS
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RS485/RS422 Side |
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Pin |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
4 |
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Jumper |
J2
(default: ON) |
J3
(default: ON) |
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J1
(default: ON) |
J4
(default: ON) |
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RS485 |
A+ (J2 ON) |
B- (J3 ON) |
GND |
(J1 ON) |
Terminate/remove Jumper J4
to turn ON/OFF the 120Ω
end-of-line terminator. |
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RS422 |
(J2 OFF) |
(J3 OFF) |
GND |
(J1 OFF) |
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TX+ |
RX+ |
TX- |
RX- |
GND |
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 Note:
The RS485 / RS422 repeater (Model: RPT-485_422-2) comes with
two (2) nos. of 6-way terminal blocks 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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JUMPER SETTINGS FOR RS485 /
RS422 MODES
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1) RS485 Mode |
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Turn ON Jumper 1, 2 & 3, turn
OFF Jumper 4 for RS-485 mode; |
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2) RS422 Mode |
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Turn OFF Jumper 1, 2, 3 & 4
for RS-422 mode; |
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CONNECTIONS (RS485 RS422
EXTENSION AND CONVERSION)
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Figure 1:
Two-wire RS-485 Repeater |
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(Note: The
maximum number of supported nodes depends on the RS-485
master) |
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Figure 2:
Four-wire RS-422 Repeater |
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(Note: The
maximum number of supported nodes depends on the RS-422
master) |
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Figure 3: Two-wire
RS-485 <=> Four-wire RS-422 |
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TROUBLESHOOTING INSTRUCTIONS
FOR RS485 RS422
REPEATER / EXTENDER
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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 an RPT-485_422-2 to your PC's RS422 port and
remove Jumper 1 and terminate Jumper 2 and 3 on the
loopback-side termination board (as shown above).
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Run 232Analyzer
FREE version software on your computer.
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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 repeater. This is very helpful when you are in doubt
about the performance of your repeater.
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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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