The IA-3123 is an intelligent 64 Digital Input discrete channels module, with an excellent input noise immunity to overcome Industrial and wide plan installations. The IA-3123 can be easily expanded to monitor hundreds of digital channels through a single COM port while using its Dazy-Chain structure. The IA-3123 has a unique capability of handling both Positive and Negative logic inputs. While the Industrial society commonly uses the Negative Logic method, there are many other sectors that prefers the Positive Logic way. The IA-3123 supports them all. The IA-3123 has a wide signal input range, 5V to 30VDC, that makes it capable of support both Industrial common used 24V signal lines as well as Lab common used 5V TTL level signals, and a verity of others like security 12VDC systems in between. Another unique IA-3123 feature is the Input Masking capability. Usually it’s a host task, but in some specific cases, masking at hardware level is preferred.