9323 Hamilton

Mentor, Ohio 44060 - USA



Scientific Solutions ® Inc.,

BaseBoard ® RL-520 Adapter

RL-520 Adapter for LabMaster Mixer
RL-520 Adapter

RL-520 Adapter & cable
RL-520 Adapter shown with 50 position ribbon cable (Adapter & Cable included in kit)

The RL-520 Adapter is used to interface the BaseBoard equipped with an Opto-Isolation INPUT module to a Rice Lake Indicator model RL-520.  The combination of the Opto-Isol INPUT module and the  RL-520 Adapter is used to protect the BaseBoard's Digital I/O circuits from being damaged.  Typically, this combination is used for Erie Strayer Cement Mixing products.

The RL-520 Adapter is a small interface that contains a circuit board and two connectors.  The Adapter comes with a 50 position cable.

The features of the adapter are:

Explanation of why this adapter is needed:

The BaseBoard / ISA contains four main Digital I/O controllers. These are the 40pin chips located along the top of the card.  In some cement mixing applications, these Digital I/O controllers become damaged.  This issue appears to be associated with interfacing the BaseBoard to the Rice Lake Indicator Model RL-520.  Scientific Solutions tested the BaseBoard with the Rice Lake model RL-520 and found that depending upon how devices are powered-up and initialized, a situation could exist that causes "Latch-up" damage to the BaseBoard circuits.

This does not appear to be a design problem with the BaseBoard or the RL indicator, but rather is a system issue of properly mating the two pieces of equipment.

To solve this issue, Scientific Solutions suggests that you install Opto Isolation INPUT modules on the BaseBoard.

The Opto Isolation module attaches directly onto the BaseBoard card inside the computer and provides protection from damage when power is off to the BaseBoard but inputs from external equipment are active (a potential situation when interfacing to the RL indicators). The Opto module provides 2500v optical isolation protection and can handle over-voltage inputs and floating grounds. The Opto Isolation INPUT modules are about 2” x 3” with a 40 position socket connector and a 50 pin header connector. The module plugs onto the current 40 pin connector of the BaseBoard. The 50 pin header of the Opto Isolation INPUT module is then used to connect to a ribbon cable.

Without the Opto-Isolation INPUT module, the RL indicator uses a cable that has a 40 position socket connector on one end to connect to directly to the BaseBoard and a DB37 connector on the other end to connect to the RL-520 indicator.

With the Opto Isolation INPUT module, the ribbon cable from the RL indicator changes.  The cable would be 50 position instead of 40 and the pin (since the Opto module provides a 50 pin connector), and the wiring is different.

Scientific Solutions offers the Opto Isolation module and a Cable & Adapter kit that can be purchased directly from Scientific Solutions and installed in the field.  With these items, the customer has everything they need to install the Opto Isolation INPUT module and cabling to protect their BaseBoard product from damage.  

Currently, Scientific Solutions has a Cable & Adapter kit for the Rice Lake Indicator Model: RL-520.

If you require a Cable & Adapter kit for a different indicator, please contact Scientific Solutions to discuss your needs.

Using the Opto Isolation INPUT module isolates the BaseBoard electronics from the indicator and therefore allows more versatility to use different indicators if desired, i.e. changing from one indicator to another would be more transparent.

Installation of the RL-520 Adapter:

Open the Computer
  1. Refer to your computer manual
Unplug the 40 pin cables
  1. You will probably see 2 ribbon cables feeding thru the back of the computer and connecting to the BaseBoard
  2. Note the RED stripe on the cables is oriented towards the top of the card
  3. Mark the cables so you know where the cables are connecting
  4. The BaseBoard has 4 ports
  5.   Mark the port number on the cable
  6. Unplug the cables that you have marked and feed them out thru the Bracket
 Remove the Cable-Clamp and the Strain-Relief Brackets
Attached to the BaseBoard is a Bracket consisting of three parts
  1. Board Retaining Bracket
  2. Cable Clamp
  3. Cable Strain-Relief Bracket
In order to remove the cables from the computer and also to remove the BaseBoard, both the Cable Clamp and the Cable Strain-Relief Bracket need to be removed.  Be sure not to lose the screws as each of these items should be put back on once the BaseBoard is re-installed and the new cables are connected.

Remove the BaseBoard from the Computer
  1. The BaseBoard is held in the computer with a single screw that attaches the Board Retaining Bracket to the computer. 
  2. Remove this screw and then you can remove the BaseBoard from the computer.

Install the Opto-Isolation INPUT modules

  1. The Opto-Isolation modules have a 40 position "socket" connector that plugs directly on the 40 position "pin" header on the BaseBoard.
  2. The Opto-Isolation module should have stand-offs already attached.
    1. These stand-offs provide support to the Opto module
  3. Plug the Opto-Isolation module on the BaseBoard port that previously had the 40 position cable
  4. Use the screws supplied to secure the Opto module to the BaseBoard

Install the BaseBoard in the computer
  1. Re-install the BaseBoard in the computer
  2. With the Opto-modules attached, be sure the BaseBoard does not hit another card already installed
  3. After the BaseBoard is in the computer, re-install the screw your previously removed into the Board Retaining Bracket

Install the 50 pin cables
  1. Feed the 50 position cables thru the BaseBoard's Retaining Bracket
  2. Be sure the RED stripe is facing towards the top of the card
  3. Plug the cable into the corresponding Opto module
  4. You should have previously marked the cables so you know which port to plug the cable into

 Re-Install the Cable-Clamp and the  Strain-Relief Brackets
Attached to the BaseBoard is a Bracket consisting of three parts
  1. Attach the Cable-Clamp to the Board Retaining Bracket
  2. Attach the Strain-Relief Bracket to the Cable-Clamp
Close the Computer
  1. Refer to your computer manual

Connect the RL-520 Adapter to the RL-520 unit
  1. Connect the 50 position cable to the RL-520 Adapter
  2. Plug the RL-520 Adapter to the DB37 connector on the back of the RL-520 Indicator