On the SCADA or DAQ side:
Practical SCADA for Industry, by David Bailey, published by Newnes, 2003
or
Practial Data Acquisition for Instrumentation and Control Systems, by John Park, published by Newnes, 2003
To all appearances, the DNP comm protocol is used only by the power people, hence
Practical Modern SCADA Protocols, DNP3, 60870.5 and Related Systems by Gordon Clarke & Deon Reynders, 2004, published by Elsevier Science & Technology