Page 97 - GuardII+ Series 4208 Platform PD User Manual

Appendix

Figure 8-3 GuardII+ Hardware Overview – SSC PD Card

8.2. Modbus Register Map

GuardII+ hosts Modbus data registers that can be used by external devices to access the
PD results of the most recent set of measurements directly from a plant control system on the
same network. This section describes the data registers hosted by the monitor.

NOTE:
The GuardII+ Modbus register map is designed for compatibility with
Modbus Application Protocol Specification v1.1b3.

8.2.1. General Modbus Register Information
• Each register is an F03 Holding Register

• Unless otherwise noted, all data is expressed as 16-bit unsigned values
• For values that are expressed as float data type, they are encoded as CD AB (or word-
swapped) floats.
• To access the data registers, connect to the GuardII+’s Ethernet address and read the
desired register using the Modus over TCP/IP protocol

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