YOKOGAWA UPM100, User Manual

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5-10
IM 77C01H01-10EN
5.2 Message and Response
Function codes are command words used by the higher-level device to obtain the D
registers information of UPM100.
Table 5-3 Function Codes
Code Function Description
03 Reads data from multiple D registers. Capable of reading data from a maximum of 64
successive registers. (D0001 to D0150)
06 Writes data into D register. Capable of writing data to one register. (D0001 to D0150)
08 Performs loop back test. Used when checking communication wiring.
16 Writes data into multiple D registers. Capable of writing data into a maximum of 32 successive
registers. (D0001 to D0150)
• The write function codes will not write into read-only or disabled D registers.
• Broadcast addressing is possible with function codes 06 and 16 only. (Also in this case,
read-only or disabled D registers will not be written.)