Your computer or PLC serial port can now individually address multiple RS232 devices up to 1.8km away. Separate transmit and receive RS485 pairs are used allowing simultaneous sending and receiving.



  • Control multiple printers5259
  • Control multiple RS232 devices from one serial port
  • Create a network of RS232 devices over 1.8km
  • Gather statistics
  • Reading multiple barcode scanners




5259 brochure

5258 and 5259 manual

Have you ever wished to connect more than one RS232 device to your computer at a time? The addressable RS232 to RS422 converter allows this. Each device can be individually selected and the computer or PLC talks to that device.

5258 to 5251 connection

For example, you want your computer to talk to 3 printers in different parts of the factory.  Wire up the 5259 converters as in the picture. The 5259 connected to printer 1 has its address set to address 1. Similarly for the 5259 connected to printers 2 and 3.


To select a printer a command is sent. This can be either the STX (02HEX) control character, or HeAdEr.

The following example sends “Hello World” to printer 1 and “Good Morning” to printer 2

HeAdEr01Hello World HeAdEr02 Good Morning


The printers only receive the data intended for them and never the command HeAdEr


Key Benefits

Time Saving:

No computer required for setting up. Complete setup with one switch
Switchable line termination
Automatic baud rate detection
High Performance:

Selected channel receives only data intended for it. No leakage of channel selection characters
Very fast data turnaround. For 8 bit no parity: 0.2ms at 9600bps
Communication distance of up to 1.2km (4000 feet)

  • Small size 1″ wide (25.4mm), light-weight unit
  • 9 – 24 volt power supply
  • Can handle binary data
  • Broadcast mode allows sending data to all RS-232 devices on network at one time

Easy to Install:

Plugs directly into your PC serial port
Plug in screw terminal connector for RS-485
Separate transmit and receive lights show data flow. Address light shows when unit selected

Full optical isolation protects your computer from power spikes
RS485 side has self resetting fuses and spike protection on each line
Robust flame retardant case
Microprocessor has watchdog protection
Three years

Used In:

Control multiple printers
Control multiple RS232 devices from one serial port
Create a network of RS232 devices over 1.2km
Gather statistics
Many other applications

Dimensions (mm) 25(w) x 80(h) x83 (d) (1″x 3.15″ x 3.26″)
Enclosure Robust ABS
Transmission Distance 1.2km (4000 feet)
Weight 90g
Operating temperature 32° to 140° F ( 0° to 50°C)
Storage temperature -4° to 158° F (-20° to 70° C)
Humidity 15 to 90% relative non condensing
Isolation Voltage 1500V max transient (to EN 60950 : 1992)
Power 9-24Vdc unregulated
Power RS485 35mA at 12Vdc
DIN rail adapter Add 32mm to depth (d)
Connectors RS232: DB9 female
RS485: Plugable 7 way screw terminal connector with strain relief 0.2-2.5mm2 (AWG 24-12)
Operating mode 4 wire full duplex point to point or Multidropp
Data rates 300 to 115200 bps
Indicator lights TXD, RXD and STATUS