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RS-485 Based Remote Intelligent I/O Expansion Unit with 4 Slots


RS-485 Based Remote Intelligent I/O Expansion Unit with 4 Slots

  Price:  $489.00  

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We ship via UPS and fastest delivery is with Next Day Air. UPS Next Day Air Early typically gets their product to them as early as 8am, Next Day Air gets their product typically there by 10:30am and Next Day Air Saver typically by 3pm. We ship same day for in stock items and the lead time is up to one week for out of stock items. Delivery is dependent on UPS and your shipping method.


RU-87P4 series is a remote intelligent I/O expansion unit that used to expand I-87K series I/O modules over the RS-485 network for industrial monitoring and control applications. There are more than 30 I/O modules supported with the unit; including analog input/output, digital input/output, counter/frequency I/O modules.

RU-87P4 is designed to be used in harsh and noisy environments, so the hardware is manufactured with wide power input ranges (10~30VDC), isolated power and operating temperature (-25°C ~ +75°C). It simplifies installation and maintenance of I/O modules with hot swappable and auto configuration, fault and error detection, dual watchdog, programmable power on and safe values.

Various software development kits (SDK) and demos are provided, such as DLL, ActiveX, Labview driver, Indusoft driver, Linux driver, OPC server, etc. The I-87K series I/O modules plugged in the RU-87Pn can be easily integrated into variant software system.

  • Hot Swappable
    • The RU-87P4 doesn’t need to shut down its power to replace or plug in I-87K I/O modules. The whole system can keep operating without any interruption.
  • Auto Configuration
    • Configurations of I-87K I/O modules can be pre configured and stored in the non-volatile memory of the RU-87P4. When the RU-87P4 is powered on or an I-87K I/O module is plugged in, the RU-87P4 automatically check and restore these configurations to each I-87K I/O modules on it.
  • System is Easily Duplicatable
    • Using the DCON Utility, you can easily make a backup of the I-87K module configurations and write to another RU-87P4. This design can easily and quickly duplicate many RU-87P series I/O Unit.
Make a Copy Make Duplicates


Interface Type (RS-485)
Baud rate 115200 bps maximum
Distance 1.2 Km (4000 ft) maximum
Isolation 3000 VDC
ESD Protection +/- 4K Contact Discharge and +/- 8K Air Discharge
Communication Protocol DCON Protocol (ASCII format)
Rotary Switch x2 , For RS-485 address
DIP Switch 8 bit *1, For auto configuration, check sum and baud rate
LED Indicators
Power Yes
System Ready Yes
Auto configuration Yes
Slot Status Yes
I/O Expansion Slots
Hot Swap Yes
Auto Configuration Yes
Support Module Type High profile I-87K module only
RU-87P1 1
RU-87P2 2
RU-87P4 4
RU-87P8 8
Dimensions (W x H x D)
RU-87P1 64 x 120 x 110 mm
RU-87P2 95 x 132 x 111 mm
RU-87P4 188 x 132 x 111 mm
RU-87P8 312 x 132 x 111 mm
Input Range 10 ~ 30 VDC (non-regulated)
Reverse polarity protection Yes
Isolation 1000 VDC
Frame Ground Yes
  Consumption Power Board Driving
RU-87P1 1 W 5 W
RU-87P2 1 W 8 W
RU-87P4 2 W 30 W
RU-87P8 2.4 W 30 W
Operating Temperature -25 ~ +75 °C
Storage Temperature -30 ~ +75 °C
Humidity 5 ~ 95%, Non-condensing

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