Measurement Computing Digital232 - Manual (Page 17)

Section 2 Getting Started
2.9
Pin Description
1 thru 8 DATA PORT1 (Input or Output).
Pin 1 is bit 1 (LSB), Pin 8 is bit 8 (MSB).
Least Significant Port
9 thru 16 DATA PORT2 (Input or Output).
Pin 9 is bit 1 (LSB), Pin 16 is bit 8 (MSB).
17 thru 24 DATA PORT3 (Input or Output).
Pin 17 is bit 1 (LSB), Pin 24 is bit 8 (MSB).
25 thru 32 DATA PORT4 (Input or Output).
Pin 25 is bit 1 (LSB), Pin 32 is bit 8 (MSB).
33 thru 40 DATA PORT5 (Input or Output).
Pin 33 is bit 1 (LSB), Pin 40 is bit 8 (MSB).
Most Significant Port
41 CLEAR (Output).
42 DATA STROBE (Output).
43 TRIGGER (Output).
44 INHIBIT (Output).
45 SERVICE INPUT (Input).
46 EXTERNAL DATA READY [EDR] (Input).
47,48 Not used.
49 +5 Volts (Do not exceed 50 mA load).
50 I/O COMMON.