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Table of Contents



Connecting to the Wildcard Bus

Sellecting the Wildcard Address


Initializing the Wildcards

C code to initialize the AC Relay Wildcard (pdf)

Forth code to initialize the AC Relay Wildcard (pdf)

Controlling a Relay

C code to control the AC Relay Wildcard (pdf)

Forth code to control the AC Relay Wildcard (pdf)


DC Relay Wildcard Users Guide


DC solid state relay wildcard

This document describes how to use the DC Solid State Relay WildCard™. It provides an overview of the hardware and software for the module as well as a schematic.

The DC Solid State Relay Wildcard allows you to control up to three, 3 amp DC loads. You can stack up to eight DC Relay Wildcards on to your Mosaic Controller or the Wildcard Carrier Board or you can mix and match any of the growing family of Wildcards. The following sections guide you through the DC Relay Wildcard’s hardware and software.

DC solid state relay specifications



The DC Relay Wildcard was designed to allow easy control of DC loads. Each DC Relay provides:

  • Control of 3 to 60 VDC loads up to 3 amps.
  • Max surge current of 12 amps for 10 ms.
  • Optically isolated control to 2500 Vrms.
  • Max turn on time of 50 us.
  • Max turn off time of 300 us.
  • Flyback and surge protection for inductive loads.
For more technical information, please consult the data sheet for the Crydom DMO063 at The next section shows you how to connect the DC Relay Wildcard to a Mosaic Controller or a Wildcard Carrier Board and how to configure the Wildcard for proper operation.
Connecting To The Wildcard Bus of a Mosaic Controller

To connect the DC Relay Wildcard to the Wildcard ports of a Mosaic controller, follow these simple steps:

With the power off, connect the Wildcard Bus on the DC Relay Wildcard to Wildcard Port 0 or Wildcard Port 1 on your controller or the Wildcard Carrier Board (These may also be called Module Port 0 or 1). If you are using a Wildcard Carrier Board, connect it to the QED Board as outlined in the "Wildcard Carrier Board Users Guide". The corner mounting holes on the Wildcard should line up with the standoffs on your controller.
The Wildcard Bus on the DC Relay Wildcard is located opposite from the screw terminals. CAUTION: The Wildcard Bus does not have keyed connectors. Be sure to insert the DC Relay Wildcard so that all pins are connected. The Mosaic controllers and the DC Relay Wildcard can be permanently damaged if the connection is done incorrectly.

Selecting the Wildcard Address

Once you have connected the DC Relay Wildcard to the Mosaic controller, you must set the address of the module using jumper shunts across J1 and J2.

The Wildcard Select Jumpers, labeled J1 and J2, select a 2-bit code that sets a unique address on the wildcard port of the Mosaic Controller. Each wildcard port on the Mosaic Controller accommodates up to 4 wildcards. Wildcard Port 0 on the Mosaic Controller provides access to wildcards 0-3 while Wildcard Port 1 provides access to wildcards 4-7. Two wildcards on the same port cannot have the same address (jumper settings). Table 1 shows the possible jumper settings and the corresponding addresses.

Table 1: Jumper Settings and Associated Addresses

DC solid state relay jumper settings

Once you have connected and configured all of the hardware properly, you can use the software drivers to control DC loads.

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