HCX4 Remote control by RS-232 or RS-485 Dual monitor outputs The 256 alarm history log S-VHS VCR input and output   HCXA4 Remote control by RS-232 or RS-485 Dual monitor outputs The 256 alarm history log S-VHS VCR input and output   HCX9 Remote control by RS-232 or RS-485 Dual monitor outputs The 256 alarm history log S-VHS VCR input and output   HCXA9 Remote control by RS-232 or RS-485 Dual monitor outputs Motion Detection (256 section)   HCX16 Remote control by RS-232 or RS-485 Dual monitor outputs The 256 alarm history log S-VHS VCR input and output   HCXA16 Remote control by RS-232 or RS-485 Dual monitor outputs Motion Detection (256 section)