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Instrument I/O Interface
The 431-X I/O port (25 pin D-sub) provides the following functions:
•
Serial data communication
Interface type: RS-232C full duplex, DCE
Parameters: 1200 Baud, 1 start bit, 8 data bits, 2 stop bits, no parity
Pin assignments:
Pin 1
Protective ground
Pin 2
Data in
Pin 3
Data out
Pin 7
Data ground
•
Switched battery connection for Data Logger
Pin assignments:
Pin 9
Battery (+)
Pin 7
Battery ground (-)
Pin 23
Battery ground (-)
•
Unswitched battery connection for external battery pack pin assignments
Pin assignments:
Pin 15
Battery (+)
Pin 19
Battery (+)
Pin 7
Battery ground (-)
Pin 23
Battery ground (-)
NOTE:
Pins 6, 8, 11, 17, 18, 20 and 21 are non-standard and should not be connected.