S3301 has total 8 channels isolated wet contact or dry contact or open-collector input, and total 6 channels isolated open-collector output. Output BUS is RS485 with has surge protection, to reduce interference by serial port communication, the output isolated by high speed opto-couplers. The modules are slave devices that can be easily controlled via the RS485 serial interface using the industry standard Modbus protocol.

Technical data:
Input channel number ---  8
Input range ---   +4V~+36V
Input protection ---  Static, lightning
Input signal ---  wet contact, dry contact, open-collector
Counter frequency ---   100Hz/8channels;1000Hz/1channel
Counter length ---   32-bit
Output channel number ---  6
Output signal ---  open-collector
Output current ---   maximum 40mA
Output BUS ---   RS485 with Standard Modbus protocol
Output Protection ---   Lightning,static
Power input ---   9~24V(AC/DC)
Power consumption ---  <0.6W
Ambient temperature:
Operation ---  0~70C(32~158F)
Storage ---   -20~85C(-4~185F)
Ambient humidity ---   10%~90%RH
Material,enclosure ---   Flame proof plastic
Enclosure rating ---   IP31
Colour ---   Ice Blue
Size ---   100*69*25 mm

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