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INTRODUCTION (INDUSTRIAL RS485
TO RS422 CONVERTER / REPEATER)
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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 to RS-422 converter, which can be used to convert a two-wire RS-485
signal into a four-wire RS-422 signal, and vice versa. It
can also be used to extend the RS-485 or RS-422 distance to
up to 4000 ft (1.2km).
This
product features data direction auto-turnaround. Therefore,
no flow control is required.
data sheet |
FAQs
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FEATURES (INDUSTRIAL RS485 TO
RS422 CONVERTER / REPEATER)
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Converts 2-wire RS485 to 4-wire RS422 and vice versa.
- Can also be used to extend RS485 or RS422 distance.
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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
TO RS422 CONVERTER / REPEATER) |
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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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CONVERTER 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 converter (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 for RS-485 mode;
- IMPORTANT: Turn ON J4 (120 Ohm End-Of-Line
Terminator) at both ends of the RS-485 bus. |
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2) RS422 Mode |
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- Turn OFF Jumper 1, 2 & 3 for
RS-422 mode;
- IMPORTANT: Turn ON J4 (120 Ohm End-Of-Line
Terminator) at both ends of the RS-422 bus. |
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CONNECTIONS (RS485 RS422
CONVERSION AND EXTENSION)
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Figure 1: Two-wire
RS-485 <=> Four-wire RS-422 Conversion |
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Figure 2:
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 3:
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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TROUBLESHOOTING INSTRUCTIONS
FOR RS485 RS422
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 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 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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