... change of contact state. 2. Technical feature- Input 32 Passive Dry Contacts or 32 Active Wet Contacts Response time < 2ms Scanning time ... Information technology equipment(ITE) Level B3. ExamplesExamples1Read the state of 32 contacts of device02 (by order 03H)Request: 0x02,0x03,0x00 ... NC and others are NO.Examples3Read the state of all 32 channels on device01 (by order 02H)Request: 0x01,0x02,0x00,0x00 ...