This user manual covers the Quasar AS3108 8-channel serial relay controller, including safety guidelines, specifications, circuit description, connections…
The Quasar AS3108 is an 8-channel serial relay controller with 4 optically isolated digital inputs, designed for control and sensing applications. It features Form C, SPDT relays capable of switching up to 5 Amps at 240Vac or 28Vdc and is controlled via a serial port using simple text commands. The board includes a latch function to maintain relay states even if the controlling PC is switched off.
| Number of relays | 8 |
|---|---|
| Relay Type | Form C, SPDT |
| Max. Rated Load (Resistive or Inductive) | 5 Amps |
| Max. Switching Voltage (Resistive or Inductive) | 240Vac |
| Min. Switching Voltage | 28Vdc |
| Min. Switching Current | 15mA |
| Number of inputs | 4 |
| Input Type | Polarised, opto-isolated |
| Input Voltage Range | 5 - 24V dc |
| Board Dimensions | 140(W) x 110(D) x 35(H)mm |
The maximum switching voltage is 240Vac for resistive or inductive loads.
No, the board requires an external controller such as a PC to send commands and monitor inputs.
A 12Vdc centre positive 500mA minimum power supply is required.