We've managed to resolve the issue. The mpc pumps just use a serial to
ethernet adapter, so the protocol is identical to the serial protocol.
I recently learned that these controllers will accept packets with a
checksum of 00, so it's not required to calculate the checksum. Also
they should report error messages for checksum errors or invalid
commands (as long as the address field is correct).
However, our particular version has both a serial port and an ethernet
port. The internal dip switches were set at the factory for RS-485
operation rather than ethernet communication. After modifying the dip
switches we have ethernet communications working well.
--
Scott Baily
AOT-IC, MS H820
Los Alamos National Laboratory
Los Alamos, NM 87545
ph: (505) 606-2260
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