i am new in plc and i have issue with allen-bradley system 
processor slc 503 slot 0
scanport slot1 comm led give red flasher no fault an it connected to 1336 plus (vfd).
at scanport dip switch 1&2 on baud rate 57.6
and dip switch at 1336 plus (vfd) i have three switches in remote I/O 1336-GM1 configerd as 
SW1: 1 OFF &2: OFF& 3:ON&4:ON&5:ON&6:ON&7:ON&8:OFF
SW2: 1:ON &2:OFF&3:ON&4:ON&5:ON&6:ON&7:OFF&8:OFF
SW3 1:OFF&2:ON&3:ON&4:ON&5:OFF&6:OFF&7:OFF:8:OFF
JUMPER J2 BETWEEN 1AND 2
at scanport terminal resistor 150 ohm
HOW I CAN MAKE SCANPORT COMMUNICATE WITH VFD 1336 PLUS ?