Solution:

About the AI alarm function, there're few mistake in the User's Manual (page 211, 219). You need to execute following command to enable the "alarm" feature. Setting/Verify AI High/Low Alarm Limits 600+NI, AA, TT, 64, CC, 00, 00, FFL, FFH Where NI : range 00-3FH, 2-character hexadecimal Node ID that is set by DIP switch. AA : 22 means 'Write' request 40 means 'Read' request (PS. You can use "600+NI, 40, TT, 64, CC" to inquire the value which had written into Flash) TT : 24 means the high alarm limits setting 25 means the low alarm limits setting CC : range 01-20H, the 2-character hexadecimal AI channel number of the ADAM-5000/CAN. FFL : low byte of count value FFH : high byte of count value Setting/Verify AI Alarm Flag Status (High, Low and None) 600+NI, AA, 21, 64, CC, FF NI : range 00-3FH, 2-character hexadecimal Node ID that is set by DIP switch. AA : 22 means 'Write' request 40 means 'Read' request (PS. You can use "600+NI, 40, 21, 64, CC" to inquire the alarm flag status which had written into Flash) CC : range 01-20H, the 2-character hexadecimal AI channel number of the ADAM-5000/CAN. FF : 00 means to get total number of AI channel 01means High alarm 02 means Low alarm Globally Enable/Disable AI Interrupt 600+NI, AA, 23, 64, CC, FF NI : range 00-3FH, 2-character hexadecimal Node ID that is set by DIP switch. AA : 22 means 'Write' request 40 means 'Read' request (PS. You can use "600+NI, 40, 23, 64, CC" to inquire the interrupt enable/disable status which had written into Flash) CC : range 01-20H, the 2-character hexadecimal AI channel number of the ADAM-5000/CAN. FF : 00 means Disable 01means Enable Kindly see the attached file for further information.