Universal RS-232 readers

RS-232 is interface for carry information between two devices distance of up to 20 meters. The information is carry along patch wires higher voltage than is standard 5V for greater interference immunity. Data transfer is asynchronous with closely set transmission speed and synchronization by trailing edge start pulse.
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The Electronics Industry Association (EIA) has developed standards for data communication. EIA standards where originally marked with the prefix "RS". "RS" means that it is a recommended standard, but the standards are now generally indicated as "EIA" standards.

RS-232 was introduced in 1962. The standard evolved over the years and had the third revision in 1969 (RS-232C). The fourth revision was in 1987(RS-232D also known as EIA-232D).

RS-232 is identical to the standards CCITT V.24/V.28, X.20bis/X.21bis and ISO IS2110.


RJ45 norm B color Function
white/orange 1 - out 1
orange 2 - out 2
x 3 – Txd
blue 4 – GND
x 5 - in 1
green 6 - Rxd
white/brown 7 - +12V
brown 8 - 

Basic Serial 9600

  • "Standard" RS-232,  9600Baud
  • Type M1

Basic Serial 19200

  • 19200Baud