STE 80722 
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2.2  Communication Specifications 
 
2.2.1  COM1 Port 
Table 2.1    COM1 port communication specifications 
 
Item  Specifications 
Interface  RS-232C 
Synchronous system  Start-stop synchronization system 
Communication system  Full duplex system 
Communication rate  300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps 
Data format  ASCII code 
No. of transfer bytes  Max. 256 bytes 
Transfer data structure    Data length: 7 or 8 bits 
Parity: None, odd, even 
Stop bit: 1 or 2 bits 
Protocol  Non-protocol communication 
Timeout  No timeout 
Fault recovery  No special protocols are used. 
 
  Note:  The communication rate and transfer data structure are specified in the user 
parameter file.    (For details, see Para. 2.3.)