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184 M208 SPECIFICATIONS: Hardware Specifications
Dual bi-directional IBM AT compatible serial interfaces, male
DE09 connectors.
Data rates supported: 50 to 38,400 bps.
The M208 acts as a DTE with this 9-pin pinout.
Table 8: 9-Pin COM1/COM2 Pinout
Pin Abbr. Name Source EIA CCITT
1 DCD Data Carrier Detect DCE CF 109
2 RXD Receive Data DCE BB 104
3 TXD Transmit Data DTE BA 103
4 DTR Data Terminal Ready DTE CD 108.2
5 GND Signal Ground - AB 102
6 DSR Data Set Ready DCE CC 107
7 RTS Request To Send DTE CA 105
8 CTS Clear To Send DCE CB 106
9 +12V 12V PWR Supply DTE N/A N/A
Serial Ports (COM1,
COM2)
54321
9876
Serial Port Pinouts