RS232 SERIAL PORT J1 AND J2 PIN OUTS CONNECTOR CPU CPU J1-J2 TI 810 (SERIAL) TERMINAL CONNECTOR 1----CHASSIS GND-------------------l 2----TXD---------------------------2 3----RXD---------------------------3 6-----------1 7----SIGNAL GND--------------------7 1 8-----------1 20---DTR---------------------------11 1 JUMPER 20----------1 CONNECTOR CPU CPU J1-J2 EPSON RX-80 (SERIAL) TERMINAL CONNECTOR 1----CHASSIS GND-------------------1 3----RXD---------------------------3 7----SIGNAL GND--------------------7 20---DTR---------------------------11 CONNECTOR CPU CPU J1-J2 EPSON MX-80 FIT (SERIAL) TERMINAL CONNECTOR 1----CHASSIS GND-------------------1 2----TXD---------------------------2 3----RXD---------------------------3 4--1 1 JUMPER 5--1 6----1 7----SIGNAL GND--------------------7 1 19---1 JUMPER 20----DTR--------------------------20 B-3