Kearfott_Isolation_Checkout
Sch/PCB Doc. No. 100221339

Rev B  S/N 001

POWER
Sh 2
Connect +5V J1 pin 3,6 
  Return on J1 pin 1,4 
Verify 5V at TP4 ( with respect to Kearfott GND )     OK
Verify current draw about 80 mAmps                    measured 24 mA steady state
Measure inrush current                                measured 1.8 A ~100 uS FWHM
Verify 5V at TP18 ( with respect to MVC GND )         OK

1 PPS
Connect 1PPS TTL Pulse into J6 pin 4
  Return on J6 pin 3
Verify 1 PPS TTL pulse to Kearfott on J1 pin 2,5 with respect to J1 pin 1,4  OK

TRIG RS232
Connect cable assembly to J7
Connect DB9 "TRIG RS232" to RS232 from computer ( part of J7 assembly )
Connect cable "RS485 TRIG" to J4
Connect jumper J5 pins 1 and 2
Verify complementary RS485 pulses on J4 pins 3 and 6
  Return on J4 pin 1                                  OK

TRIG TTL
Connect cable assembly to J7
Connect TRIG TTL pulse into J7 pin 14
  Return on J7 pin 7 (upper/middle)
Connect cable assembly to J4
Verify complementary RS485 pulses on J4 pins 3 and 6 (yel/blu)
  Return on J4 pin 1 (blk)                            OK

GPS RS232
Connect cable assembly to J7
Connect DB9 "GPS RS232" to RS232 from computer ( part of J7 assembly )
Connect DB9 "RS232_GPS" to RS232 from computer to J2
Verify communication from MVC to Kearfott
  BAUD rate 9600                                       OK
      
BI-DIRECTIONAL RS232
Connect cable assembly to J7
Connect DB9 "RS232 BI-DIR" to RS232 from computer ( part of J7 assembly )
Connect DB9 "RS232_BI_DIR" to J3
Connect jumper J8 pins 1 and 2 (left/ctr)
Verify two-way communications between MVC and Kearfott*
  BAUD rate 115200

BI-DIRECTIONAL RS485 FULL DUPLEX
Connect cable assembly to J7
Connect DB9 "BI-DIR" to RS232 from computer ( part of J7 assembly )
Connect DB9 "RS485_FULL" to J3**
Connect jumper J8 pins 2 and 3 (ctr/right)
Verify two-way communications between MVC and Kearfott*
  BAUD rate 115200                                         OK



* TeraTerm https://ttssh2.osdn.jp/index.html.en
** Dtech USB 2.0 to RS422/RS485