Header: Represents the beginning of the command and the response.
ASCII % (25H) is used.
Address (Instrument number): Numbers by which the master discerns each slave.
Instrument numbers 1 to 95 (2-digit decimal) and Global addresses EE and FF are used.
By using the Global address, the same command can be sent to all connected slaves.
For the Global address EE, EE is appended to the address of response command.
For the Global address FF, a response is not returned.
Command: Codes to discern message are described below.
ASCII Name Description
#(23H) Command Represents command message.
$(24H) Response (normal) Represents normal response message.
!(21H) Response (error) Represents response message when an error has
occurred.
Command code: 4 types of command code are listed below.
Command
Code
Contents Description
RCP Contact Area Read
(multiple points)
Reads ON/OFF status of multiple contacts
(R only).
Up to 8 points to 1 command can be
specified.
WCP Contact Area Write
(multiple points)
Multiple contacts (R only) are set to
ON/OFF.
Up to 8 points to 1 command can be
specified.
RD Data Area Read Reads the contents of data area (DT area
only).
Up to 16 pieces of data to 1 command can
be specified.
WD Data Area Write Writes data to data area (DT area only).
Up to 16 pieces of data to 1 command can
be specified.
MC Monitor Contact
Register/Reset
Registers contact (R only) to be monitored.
Up to 16 contacts can be registered.
MD Monitor Data Register/Reset Registers data (DT only) to be monitored.
Up to 16 pieces of data can be registered.
MG Monitor Data Execute Monitors registered contact or data.
Data code: Specifies data register DT.
ASCII D (44H) is used.
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