SIP Relay Module | I/O Module with 2 inputs and 2 outputs
RELAY-IO: Expansion module with 16 digital inputs that can control 16 SPDT relay outputs 5A @ 250VAC or 5A @ 24VDC each | Ipses
8ch RS232 TTL232 IO Control Switch Board Com DB9 Serial port für Momentary Self locking Verriegelung Latch Verzögerung Relais modul|Relais| - AliExpress
dS2824, dScript programmierbares Ethernet Modul mit 24 Relais & 8 I/Os
8/16-Channel Solid State Relay I/O Module | Model 2652
16 Channel Ethernet Relay Module With Io Lan Wan Network Rj45 Rs232 Tcp Ip Program Development Board Diy Smart Home Open Source - Buy Relay Remote Control,Wifi Module Relay,Smart Home Products Product
RS232/RS485 serial port control 32 relay module control switch board IO board|variable capacitor|air variable capacitorsvariable air capacitor - AliExpress