The I/O expansion board, which is manufactured by KSE, is a DIN rail expansion board from 8 IOs up to 64 IOs. Connections to KSE controllers can either be through RS232, RS422, RS485 or CAN bus. The unit has an operating temperature ranging from 0ºC to +50ºC, and storage temperature that ranges from -40ºC to +70ºC.