Schnittstelle: Com1

ER-Pin 5 ----->RXD Max232
ER-Pin 6 ----->TXD Max232
ER-Pin 7 ----->ER-Pin GND
ER-Pin 8 ----->4,5V +
ER-Pin 7 ----->4,5V -
MAX232 5V ----->4,5V +
MAX232 Masse ----->4,5V -