DMX Contact Closure Interface
The eDIN #1003 is much more than a simple DMX-controlled relay module. The specialized modes make it easy to control devices like window shades and small automation motors used in props or displays. Each relay has a normally open and a normally closed contactor (i.e. single pole, double throw) and is rated for 2 amps at 30 volts DC.
Use the animations below to choose which mode is best for your application.
Mode 1: Maintained 12 Channel Control
Each of the 12 relays are maintained on as long as their respective DMX value is above a certain level. The default is 50%. The threshold may be adjusted to a level other than 50% with the UTIL menu option.
Mode 2: Momentary 12 Channel Control
Often shade controls only want a momentary press, such as someone touching a raise or lower button. When the DMX channel for a given relay passes through the 50% threshold, either increasing or decreasing, the relay will close for 250mS.
Mode 3: Momentary “ON” 12 Channel
Similar to Mode 2, but only works when the DMX level is going up. It activates the relay for a quarter second when the DMX channel is increasing and passes through the 50% threshold.
Mode 4: Momentary 6 Channel Split
This is the most common mode to control six window shades because adjacent relays are paired to a single DMX channel (1 and 2, 3 and 4, etc), one for "ON" operation, and one for "OFF". That way, one DMX channel can ‘press’ the UP button for the shades when going up, and the DOWN button when coming down. When the DMX level of the control channel for a given pair passes through the 50% threshold, increasing, the lower number relay will close momentarily. When the DMX level is coming down and passes through the 50% threshold, the higher number relay of the pair will close momentarily.
Mode 5: Maintained 6 Channel Split
This is basically a repeat of Mode 1, using two relays. It makes sense to use when you need a double throw/double pole. Adjacent relays are paired to a single DMX channel, one relay for "ON" operation, and one relay for "OFF". When the DMX level of the control channel for a given pair passes through the 50% threshold, increasing, the first relay will close and maintain state, while the second relay will open. When the DMX level for a given pair decreases through the 50% threshold, the first relay will open while the second relay will close and maintain state.
Mode 6: Momentary Split with Secondary ‘Reset’
Two sequential DMX channels are associated with each adjacent pair of relays. When the lower DMX channel increases through 50%, the lower-numbered relay will close for a quarter second. When the lower DMX channel decreases through 50%, the higher-numbered relay will close momentarily. To provide a secondary reset, when the higher DMX channel passes through 50%, increasing, the just the second relay will close momentarily. When the higher DMX channel decreases through 50%, the both relays remain unchanged.
Mode 7: Chase
Each contact closure will be triggered in turn. This mode is intended as a test feature. Use the DMX channel controlling contact closure #1 to set the group of relays involved: 0% = no contact closures; 100% = all twelve contact closures. Use the DMX channel controlling contact closure #2 to set how long the relays are to remain closed: 0% = <10ms; 100% = 2 seconds.
Mode 8: Single Channel Select
In this mode, one DMX slot controls all 12 relays. Raising the DMX level of the start channel will trigger each contact closure in turn, from none up to the twelfth.
Trigger values are shown in the chart below. These values are also used by Mode 9.
Mode 9: Single Channel Build
This mode can be handy in displays where you’re adding lights as the DMX level raises. Think a segmented audio VU meter or perhaps an LED lamp where more DMX means more LEDs, hence brighter. Raising the DMX level of the start channel will trigger each contact closure additionally. At zero percent, no contact closures are trigger, while at full all twelve contact closures are triggered.
The 1003 also has a DMX Present relay to indicate when DMX is active (Normally Open contact) or absent (Normally Closed contact). You might tie all your commons through this relay if you don’t want any activity when the console is not present. (Do not exceed the 3A working rating of the relay!) We’ll discuss how to use DMX Present relays in detail in Tip #8.