Software Communication 3-15
When the pump responds to a query, the first byte of the data block is the status
byte. It is defined like the status byte in the RS-232 and RS-485 protocols. The
next byte is a null character. The remaining six bytes are for the response in ASCII.
If the pump is only reporting current status, the message is only two bytes long. If
the reply consists of more than six bytes, multi-frame messages are used.
CAN DATA BLOCK
The data block tells the pump what to do. Pump commands are sent in ASCII just like in
RS-232 or RS-485. For command strings that are more than eight bytes in length, multi-
frame messages are used. This permits long program strings to be sent as with the other
communications interfaces (remember that the XP 3000 buffer size is 256 characters).
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