E53EN01,
E53-EN01,COMMUNICTN UNIT RE-232C FOR E5AK
E53-EN02,COMMUNICATN UNIT RE-422 FOR E5AK
E53EN03,
E53-EN03,COMMUNICATN UNIT RE-485 FOR E5AK
E53Q,
E53-Q,OUTPUT UNIT PULSE NPN FOR E5AK
E53-Q3,OUTPUT UNIT PULSE NPN FOR E5AK