Wiring panel and terminal functions

The CR350 wiring panel provides ports and removable Closedterminals Point at which a wire (or wires) connects to a wiring panel or connector. Wires are usually secured in terminals by screw- or lever-and-spring actuated gates with small screw- or spring-loaded clamps. for connecting sensors, power, and communications devices. It is protected against surge, over-voltage, over-current, and reverse power. The wiring panel is the interface to most data logger functions so studying it is a good way to get acquainted with the data logger. Functions of the terminals are broken down into the following categories: ‪

  • Analog input
  • Pulse counting
  • Analog output
  • Communications
  • Digital I/O
  • Power input
  • Power output
  • Power ground
  • Signal ground

 


Analog input terminal functions
SE
DIFF		 1   2
┌1┐
H   L		 3   4
┌2┐
H   L
Single-Ended Voltage ✓ ✓ ✓ ✓
Differential Voltage H L H L
Ratiometric/Bridge ✓ ✓ ✓ ✓
Thermocouple ✓ ✓ ✓ ✓
Current Loop ✓ ✓    

 

Pulse counting terminal functions
  C1 C2 P_SW P_LL SE1 SE2 SE3 SE4
Switch-Closure ✓ ✓ ✓   ✓ ✓ ✓ ✓
High Frequency ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Low-level AC       ✓        
Quadrature ✓ ✓     ✓ ✓ ✓ ✓
Period Average ✓ ✓     ✓ ✓ ✓ ✓

 

Analog output terminal functions
  VX1 VX2
Switched Voltage Excitation ✓ ✓

 

Voltage output terminal functions
  C1 C2 SE1-4 VX1 VX2 P_SW

12V

SW1

SW2
3.3 VDC     ✓ ✓ ✓ ✓    
5 VDC ✓ ✓   ✓ ✓      
BAT +             ✓ ✓

 

Communications terminal functions
  C1 C2 SE1-3 RS‑232 COM2 COM3
SDI-12 ✓ ✓        
RS-232       ✓ ✓ ✓
RS-232 0-5V ✓ ✓        
GPS Time Sync ✓ ✓ ✓      
GPS NMEA Sentences Rx Rx   Rx    
RS-485 Half duplex        
Tx (A-) Rx (B+)
Tx (A-) Rx (B+)
RS-485 Full duplex         Tx pair Rx pair

Communications functions also include USB

 

Digital I/O terminal functions
  C1 C2 P_SW SE1 SE2 SE3 SE4
General I/O ✓ ✓ ✓ ✓ ✓ ✓ ✓
Pulse-Width Modulation Output ✓     ✓ ✓ ✓ ✓
Interrupt ✓ ✓ ✓ ✓ ✓ ✓ ✓