1. 2 2 RS 232C SRS 232Ci EIA RS 232C DTE 2ch 22Kbyte 2 Kbyte IO 16bit 8bit 4 IRQ3 7 IRQ9 12 IRQ14 IRQ15 8251A 8MHz DC5V 650mA DC 12V 40mA D SUB 9 RDED 9P_LNA x 2 ISA 161 6mm X 106 5mm 2. 22Kbyte 2Kbyte PC AT CPU XON XOFF 2 RW 300 600 1200 2400 4800 9600 19200 38400 bps 75 76800 bps 5 6 7 8bits 1 1 5 2 bits RTS CTS DTR DSR XON XOFF XON 3. 3 74LS273 Ce a i 3 4 G b GAL16V8A 74LS245 0 1 140 0011 5 26 22 3F TEL 03 5460 1739 FAX 03 5460 1759 e mail support kcj co jp HomePage http www kcj co jp 4. XOFF byte D SUB 9 RDED 9P LNA DTE DCD Data Carrier Detect DSR Data Set Ready RXD Received Data RTS Request To Send TXD Transmitted Data CTS Clear To Send DTR Data Terminal Ready RI GND Signal Ground Response Indicate 174 2 21 5 161 6 74LS14 74LS74 SN75188N SN75150 3 DDDNNDD 19 660M 82C51AM 10 SN75189N HM62256ALSP a 74LS07 SN75189N HM62256ALSP 0 lt MM i SN75189N G EP ROM 27C256 MB8422 74LS240 ww S 5 GAL16V8A 5. RS 232C SRS 232Ci RS 232C SRS 232Ci EIA RS 232C ISA PC AT ISA 1 2 CPU CPU CPU CPU BASIC C 1O 38400bps 300bps 38400bps