The SDM-IO16 expands the digital input and/or output capability of Campbell Scientific dataloggers.
It offers similar functionality to the control ports of the datalogger. When configured as an input, each port can monitor logic state, count pulses, measure signal frequency, and determine duty cycle. The SDM-IO16 can also be programmed to send an interrupt signal to the datalogger when one or more input signals change state.
Features
Provides 16 digital I/O ports
Input configuration options: Monitor logic state, count pulses, measure signal frequency, and determine duty cycle
Output configuration options: Port set to 0 or 5 V by datalogger or source current up to 100 mA
When driving loads, external power supply recommended
Complies with EN61326:1997
Specifications
Operating voltage: 9 to 18 Vdc
Current drain: 600 microamps typical standby (all ports high, no load, excludes pulse counting)
3 microamps maximum (active will all 16 port counting pulses at 2 kHz and no output load)
Output
Voltage (no load): ON/HI - nominal 5 V, minimum 4.5 V; OFF/LO - nominal 0 V, maximum 0.1 V
Source current: output will source 42 mA@ 3 V; 133 mA short-circuited to ground
Input
Voltage: High - 4.0 v minimum threshold, Low - 1.0 V maximum threshold
