The XS202 is a bi-directional RS232 to RS422 converter which is port-powered but with an optional external power terminal which allows you to power the converter from an external power source.

An internal amplifier supplies power from the RS232 port without initializing the RS232 to RS422 converters serial interface. If the RS232 port is incapable of supplying sufficient power an external 5VDC power supply can easily be connected to the converter via the terminl header.

This RS232 to RS422 converter supports 4-wire balanced full duplex RS232 to RS422 converter communication, which allows your applications to operate in full-duplex. The transmission rate of 300 - 115200bps can be applied to point-to-point and point-to-multipoint networks.

This RS232 to 422 converter is suitable for most applications, including industrial, commercial and any general office computer device. It is a RS232 to RS422 bi-directional, (meaning it communicates in both directions), reliable and cost-effective RS232 to RS422 converter that easily lets you connect any RS422 device directly to your computer's serial RS232 COM port, efficiently converting standard RS232 to RS422 signals in full-duplex RS422 and vice versa.

This particular converter utilizes the popular MAX491 processor chip from Maxim/Dallas Semiconductor and a supporting drive chip from Philips.

A simple and reliable RS232 to RS422 converter for most general and industrial communication needs.
Header terminal board is included with each converter.

Overall features

Port-powered RS232 to RS422 converter
No external power supply required
Fail-safe bias resistors
Plug and play, no drivers needed
Static and surge protected RS232 to RS422 converter
Optional external power supply
Handshake control not required, no flow control needed
Terminal board included with each unit

Datasheet, overview and technical details

Download software, diagnostics and troubleshooting

Tech Support, technical support and guidelines

SPECIFICATIONS
Model number	XS202
Baud rate	300 - 115200bps
Power	Port-powered from RS232 (RTS, DTR, TXD). Optional external power: 5 - 12VDC
Processor	MAX491 / Philips HEF4093
Current consumption	Less than 10mA
Interface RS232	DB9 female connector
Interface RS422	DB9 Male and terminal board
Working mode	4-wire RS232 to RS422 asynchronous, full-duplex differential
Standards	EIA/TIA RS232 / RS422 converter
Transmission distance	RS232: Typical: 15 FT (5m) RS422: Typical 4000FT (1200m)
Electro-static/surge protection	1500W / 600W/ms
Housing	ABS plastic
DB9 sockets and shields	Electroplated steel
DB9 pins	Stainless steel
Operating Temp.	-40°F to 180°F (-25°C to 70°C)
Operating humidity	5% To 95% - No Condensation
Dimensions	2.47" x 1.33" x 0.70" (62.8 mm x 33.8 mm x 17.8 mm)
Compliance	CE, FCC, RoHS, ISO 9001
Warranty	2-year Limited Warranty

Pin	RS232 DB9 Female	RS422 DB9 Male	Terminal board
1	DCD	TX+	TX+
2	RXD	TX-	TX-
3	TXD	RX+	RX+
4	DTR	RX-	RX-
5	GND	GND	GND
6	DSR	+5 ~ +12VDC	+5 ~ +12VDC
7	RTS	-	-
8	CTS	-	-
9	RI	-	-

Click images to enlarge

Don't have a COM port?

Try our USB to RS422 adapter

Price: $18.90

Part: XS202
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Reviews for this product

Displaying 1 to 5 (of 5 reviews)

Date Added: 04/15/2013 by Jeffrey White

5 of 5 Stars

Thanks for the speedy shipping. Adapter works well. Very satisfied.

Date Added: 03/27/2011 by Barry Fanion

4 of 5 Stars

works fine, thanks

Date Added: 03/04/2010 by Dean Stanton

4 of 5 Stars

Been using this every day for almost a year without problems. Highly recommended.

Date Added: 01/22/2010 by Paul Calden

4 of 5 Stars

Good allround adapter. Worked fine with my application

Date Added: 01/21/2010 by Mike Brooks

4 of 5 Stars

Compared to most other adapters at this price, this is one of the best I have tested. No latencies, ...

Displaying 1 to 5 (of 5 reviews)

Quick Tips!

Using a RS232 to RS422 converter as an extension cord.

You can use a RS232 to RS422 converter simply for converting RS232 signals to RS422 signals, for example if you need to communicate with a RS422 device via your computer. However, you can also use two RS232 to RS422 converters for extending a RS232 connection. You do this by placing a RS232 to RS422 converter at each end of the two RS232 devices you wish to extend and then run the RS422 signal between the two RS232 to RS422 converters. This way you can extend the distance between two RS232 devices up to 400 feet.

How does a RS232 to RS422 converter work?

A RS232 to RS422 converter takes a standard two-wire RS232 signal and converts it into four wire balanced differential data transmission, the converter does this bi-directional, meaning in both directions. The RS422 converter was designed for communication over long distances, up to 4000 feet and is ideal where electical noise might be an issue, since the RS422 converter due to its differential signalling is more resistant to noise than other communication protocols. RS422 is a full duplex protocol which means that the converter can transmit RS422 data and receive RS422 data at the same time. Another advantage of the RS422 converter is that it can reach speeds of up to 10Mbps if it has been designed for these high speeds. As with most other converter units the RS422 converter is transparent to the devices its connected to, it is usually classified as an automatic RS422 converter which means that it automatically takes care of timing problems in relation to the software or device it is connected to. Twisted pair wiring.
We always recommend using 4-wire twisted pair cabling with a ground wire for RS422 converter communication. If the two pairs are shielded from each other its even better. The twisted pairs will reduce electrical noise.

How to test if a RS232 to RS422 converter is working properly

Sometimes it can be difficult to troubleshoot a communication system with a RS232 to RS422 converter. Its often hard to determine what is causing the fault, so a good idea is to first check if the RS232 to RS422 converter is working properly. Checking if a RS232 to RS422 converter is working properly is actually very easy. The first thing you need to do is to connect the RS232 to RS422 converter to your computer, you can use a USB to RS232 converter if you dont have a built-in RS232 or RS422 port in your computer. Then you install a terminal program such as AccessPort or Hyperterm on your computer to start sending data through the serial port. With the RS232 to RS422 converter connected to your computer and while sending data to the RS422 port of the converter you simply loop-back the TX and RX signals on the RS232 to RS422 converter. If you are getting data back through the RS232 to RS422 converter and can receive it in your terminal program then the RS422 converter is most likely working properly.

Chose the right RS422 converter for the job.

We have several models of RS232 to RS422 converter units. Since it is important to chose the right RS422 converter for the job we recommend that you take a closer look at the defferent models available. Take a look at our selection of RS232 to RS422 converter products.