Select by Inputs
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   Inputs  Isolated  DC Range AC Range  Counters  Relays  Control  Daisy  Special Features
 IA-3137-2  2  yes  ---  90 to 240V  ---  16  RS-232  yes  90 to 240VAC Digital Inputs!
 IA-2522-U  3  no  5V  ---  3  2  USB  no  Compact sized, moderate priced  
 IA-3302  2 + 2  yes  5 or 24V  ---  ---  2  RS-232  yes   Isolated + Non Isolated  Inputs, DIN Rail
IA-3304-U   4  yes  5 to 24V  --- ---  USB  no  Opto-Isolated / Non-Isolated / Dry-Contact 
 IA-3011-5  8  yes  5 - 30V  ---  ---  8  Digital  no  TTL to Relays, Isolated 5-24VDC to TTL
 IA-3088-2  8  no  5 - 24V  ---  1  8  RS-232  yes  Local Panel for CTL and Status, DIN Rail
 IA-3088-5  8  no  5 - 24V ---  1  8  RS-485  yes  Local Panel for CTL and Status, DIN Rail
 IA-3135-2  8  yes  5 - 30V ---  ---  8  RS-232  yes   Isolated or Non Isolated Inputs
 IA-3136-2  8  yes  5 - 30V ---  ---  8  RS-232  yes   Isolated or Non Isolated Inputs
 IA-3126-U  16  no  5-30V  ---  ---  16  USB  yes   Dry-Contact/TTL/PLC  Digital Inputs
 IA-3324  24  no  5V ---  ---  ---  RS-232  no  24 Digital I/O ch, 50pin Ribbon, Pull-up/dn
 IA-3123  64  no  5-30V  ---  ---  ---  RS-232  yes  Automatic Report, Positive or Neg. Logic