Vax RS 232C - Manual (Page 4)

Page 4 of 24
3. COMMAND CONFIGURATION
•
• is in the range of 80H to FFH. and are in the
range of 00H to 7FH.
• Data length (N) refers to the length of the subsequent data of Data 1 to Data N.
• If received data contains more byte data than the Data length, these exceeding data are
abandoned.
• If a next command received contains byte data shorter than the Data length, the previous
command is abandoned.
4. TRANSMISSION DATA AFTER COMMAND RECEPTION
When normal data is received, the same data as the reception data is to be transmitted.
Example: 91H, 03H, 00H, 00H, 00H (Reception data)
91H, 03H, 00H, 00H, 00H (Transmission data)
When channel data is received and the data is outside of the range, the data is to be
inverted and transmitted.
Example: 91H, 03H, 00H, 08H, 00H (Reception data)
91H, 03H, 00H, 77H, 00H (Transmission data)
When abnormal data is received, the data is to be inverted and transmitted.
Example: 91H, 03H, 00H, 00H, 6AH (Reception data)
91H, 03H, 00H, 00H, 15H (Transmission data)
When data other than channel data is received and the data is outside of the range, no data
is transmitted.
Example: 91H, 03H, 05H, 00H, 6AH (Reception data)
No response
5. CONTROL COMMAND AND SETTING VALUE
Command Data length (N) Data 1 Data 2 Data N
Data
Data length Command