DS2423_COUNTER_BUF_COUNTER
counter = buf[DS2423_COUNTER_BUF_COUNTER]
| (buf[DS2423_COUNTER_BUF_COUNTER+1] << 8)
| (buf[DS2423_COUNTER_BUF_COUNTER+2] << 16)
| (buf[DS2423_COUNTER_BUF_COUNTER+3] << 24);