ARM708-RS - 8-channel alarm RS-485 expansion board - Dahua

Expansion Module - ARM708-RS - Dahua Technology - 8 alarm output channels - RS-485 interface with range up to 300m on RVV2 × 1.5 cable - Jumper for switching between NO (Normally Opened) and NC (Normally Closed) - Remote update (from client software) - Address setting via DIP switch - High quality product.