Velleman VMB4RYLD - Manual (Page 7)

VMB4RYLD 4-channel relay module user manual - version 1 7
LED INDICATIONS
Output LED:
• off when consumer is switched off
• on when consumer is switched on
• blinks rapidly when timer 1 is running
• blinks slowly when timer 2 is running
• blinks shortly twice at communication
error
On LED:
lights when power
voltage is present
Rx LED:
lights at Velbus data
reception
Tx LED:
lights at Velbus data transfer