28
UNIT ADDRESS 00
SCRL PRESS RESET TO Force storage of dipswitch settings before 8 hours time-out.
ACCEPT SETTINGS
MODE AUTO 45 Mode key returns to normal run message.
SYSTEM INFO
The sub-menu “SYSTEM INFO” allows the user to review information pertaining to the operation of
the control (e.g. average main flame signal strength, status of the high fire and low fire end switches,
etc.). The MODE key is used to enter the “SYSTEM INFO” sub-menu, and the SCRL key is used to
advance.
Press Screen Displays Description
SCRL AUTO 45 SCRL key advances through the historical information until
SYSTEM INFO > “System Info” is displayed. Pressing and releasing
the MODE Key enters the sub-menu.
MODE AUTO 45 The average flame signal strength of the pilot flame = 22
AVG. PILOT FLM 22
SCRL AUTO 45 The average flame signal strength of the main flame = 40.
AVG. MAIN FLM 40
SCRL PRESS RESET TO Historical data will be cleared to 0. Must be done while
CLEAR HISTORY terminal I-7 is open.
MODE AUTO 45 Mode key returns to run message.
FLAME SIGNAL
COMMUNICATIONS
The protocol to be used is Modbus RTU. This is implemented by the master (PC, PLC, etc.) issuing a
poll to the slave (MicroM) and the slave responding with the appropriate message.
A typical format of a poll request is as follows:
DST refers to the logical address of the slave set but using reset pushbutton or ED510.
FNC is the function being requested. FNC 03 is a read request.
ADR is the message number or register number of the data being requested. In Modbus, register
addresses begin at 40001 but is interpreted as address 00.
DAT is the number of words being requested. A word is an integer consisting of 2 bytes.
The normal response from a slave is as follows:
DBC is the data byte count being returned. It must be two times the DAT number from the poll
request.
DATA is the data returned and is always a series of 2 byte integers. If 4 words were requested then
DBC would be 8 and there would be 8 data bytes or 4 data words containing the requested data.
DST FNC ADR
HI
ADR
LO
DAT
HI
DAT
LO
CRC
LO
CRC
HI
DST FNC DBC DATA….
Hi/Lo
CRC
LO
CRC
HI
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