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AS3108KT - 8-Channel RS232 Serial Relay Controller Isolated IO Board

Ability Level 4: AdvancedProduct Formats Available: Pre-Assembled Module (AS) or
Self-Assembly Electronic Kit ( Soldering Required)

General purpose RS232 serial port IO controller board featuring 8 relay outputs and 4 opto-isolated inputs for use in a wide variety of control and sensing applications including load switching, external switch input sensing, contact closure and external voltage sensing.

Eight independent relay outputs (can be increased to 16 if you use two 3108 units and our upgrade kit Order Code 3108U). Each output is capable of switching resistive loads up to 48Vac/24Vdc @ 5 amps max and have high quality detachable screw terminal block connectors. (*NB The relays are rated to switch up to 240Vac mains voltage but the exposed screw terminal block heads would need to be placed inside a suitable enclosure to prevent exposure to hazardous voltages).

Four 5-24Vdc opto-isolated digital inputs.

Can be used with the optional PCUSB6 for USB connection.

Housed in a high quality ABS plastic enclosure with detachable screw terminal block connectors for all IO connections.

Can be controlled using simple ASCII text based serial protocol or our free Windows 3.1 to 10 compatible software (details below).

All components provided including a high quality case with pre-punched and silk screened front and rear panels to give the kit a professional and attractive finish as shown in the photos. High quality DS PTH PCB.

PowerRegulated 12Vdc (Order Code 660.446UK is suitable)
Current Consumption400mA max (50mA standby plus ~30mA per active relay)
Outputs8 x SPDT Relays
Maximum Output
Load (Resistive)
Up to 48Vac* or 24Vdc @ 5 Amps max. per relay (Relay Datasheet)
Output ConnectionsNO, NC, C (Relay FAQ)
Inputs4 x 5-24Vdc opto-isolated digital inputs
Computer InterfaceStandard RS232 DB9 (M-F) Serial port (optional PCUSB6 for USB connection)
EnclosureABS UL94 rated, 140W x 110D x 35H mm
Overall Dimensions~ 140W x 140D x 35H mm
ConnectionsPower: 5.5 x 2.5mm DC socket
Relays: 8 x 3-way pluggable screw terminal blocks
Inputs: 4 x 2-way pluggable screw terminal blocks
Computer: Male DB25 connector
Product FormatSELF-ASSEMBLY Electronic Kit (KT) or
PRE-ASSEMBLED Electronic Module (AS) Product Formats Info
DocumentationUser Manual
SoftwareWindows Software Interface
Free Terminal Program
  • Power Supply: 12V, 500mA min. DC Power Supply (Order Code 660.446UK)
  • M-F Serial Port Lead (Order Code LDC441) (optional PCUSB6 for USB connection)
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