31p. DIN 41617

   1  - 5 V
 2    + 12 V
   3  
 4    SENS
   5  8224-2
 6    GND
   7  PPI-PB3
 8    PPI-PB2
   9  PPI-PB4
10    PPI-PB1
  11  PPI-PB5
12    PPI-PB0
  13  PPI-PB6
14    PPI-PC3
  15  PPI-PB7
16    PPI-PC2
  17  PPI-PC1
18    PPI-PC0
  19  PPI-PC4
20    PPI-PC5
  21  PPI-PC6
22    PPI-PC7
  23  PPI-PA7
24    PPI-PA0
  25  PPI-PA6
26    PPI-PA1
  27  PPI-PA5
28    PPI-PA2
  29  PPI-PA4
30    PPI-PA3 
  31  + 5 V


25p. Sub-DE

 1 - XI 0
 2 - XI 1
 3 - XI 2
 4 - XI 3
 5 - XI 4
 6 - XI 5
 7 - XI 6
 8 - XI 7
 9 - XO 7
10 - XO 6
11 - XO 5
12 - XO 4
13 - XO 3

14 - Vdd +12V
15 - Vcc  +5V
16 - Vbb  -5V
17 - Receive current loop MCT272-1 Anode
18 - Receive current loop MCT272-2 Cathode
19 - Vss GND
20 - SENS
21 - Transmit current loop MCT272-5 Collector
22 - Transmit current loop MCT272-4 Emitter
23 - XO 0
24 - XO 1
25 - XO 2

XI n, XO n and SENS are TMS5501 pins