RS232 SERIAL PORT J3 PIN OUTS PIN SIGNAL MODEM PIN OUT I----PROTGND--------------------------------------l 2----TXD*-----------------------------------------3 3----RXD*-----------~-----------------------------2 4----RTS------.------------------------------------5 5----CTS------------------------------------------4 6----DSR------------------------------------------20 7----GND------------------------------------------7 8----CARDET 9 NC 10 NC 11 NC 12 NC 13 NC 14 NC 15---TX TIMING 16 NC 17 ---RX TIMING 18 NC 19 NC 20---DTR------------------------------------------6 21 NC 22 NC 23 NC 24 NC 25 NC B-2