Reading Mitutoyo digital micrometer with rasberry pi

Question

Im trying to read the value from my Mitutoyo digital micrometer 543-390B Datasheet. The micrometer is using a smartbox to communicate with PC, the box is using P87C51SBPN microchip P87C51SBPN Datasheet. I tried to find out to what pin the micrometer is connected to and it is connected to the pins 2,3,4 and 39. I used the connection apporach from link and also the python code from here link code. When i run the code nothing happens no error either any data from the micrometer. Again this is the code im using

import time
import pigpio

REQ=4
CLK=3
DATA=2

# The callback implements the Mitutoyo SPC protocol
# 13 4-bit nibbles, least significant bit first.

def cbf(gpio, level, tick):
   global in_data, bit, nibble, nibbles, data_level
   if gpio == REQ:
      nibble = 0
      bit = 0
      nibbles = [0]*13
      in_data = True
   elif gpio == DATA:
      data_level = level
   else: # CLK
      if in_data:
         nibbles[nibble] |= (data_level << bit)
         bit += 1
         if bit > 3:
            bit = 0
            nibble += 1
            if nibble > 12:
               print(nibbles)
               in_data = False

pi = pigpio.pi()
if not pi.connected:
   exit()

in_data = False
bit = 0
nibble = 0
nibbles = [0]*13
data_level = pi.read(DATA)



pi.set_mode(REQ, pigpio.OUTPUT)
pi.write(REQ, 1)
pi.set_pull_up_down(CLK, pigpio.PUD_UP)
pi.set_pull_up_down(DATA, pigpio.PUD_UP)
cb1 = pi.callback(REQ, pigpio.FALLING_EDGE, cbf)
cb2 = pi.callback(CLK, pigpio.FALLING_EDGE, cbf)
cb3 = pi.callback(DATA, pigpio.EITHER_EDGE, cbf)

time.sleep(300)

cb1.cancel()
cb2.cancel()
cb3.cancel()

pi.stop()

Can someone help me with this problem? Thank you