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Explicit Message Communications
Section 6-3
Response Format
Parameters
Destination node number (command)
Specify the node number of the CPM2C-S containing the desired data in 1
byte (2-digit hexadecimal).
Service code (command, response)
Specify 1C (Hex) in the command.
The leftmost bit of the service code is turned ON in the response, so 9C (Hex)
is returned.
Class ID (command)
Always 2F (Hex).
Instance ID (command)
Specify the data area containing the desired data in 1 byte (2-digit hexadeci-
mal). Use one of the codes listed in the following table.
Address L and Address H (command)
Specify the starting word address of the read data in hexadecimal as follows:
Address L: The rightmost two digits of the 4-digit starting address.
Address H: The leftmost two digits of the 4-digit starting address.
Number of bytes (command)
Specify the number of bytes of data to read in 1 byte (2-digit hexadecimal).
The allowed range is 01 to C8 (Hex), which is equivalent to 1 to 200 decimal.
Number of bytes received (response)
Indicates the number of bytes of data (in hexadecimal) from the “source node
number” on.
Source node number (response)
Indicates the node number (in hexadecimal) of the CPM2C-S that returned
the response.
Read data (response)
Contains the desired data read from the specified data area. Word data is
returned with the leftmost byte (bits 8 to 15) preceding the rightmost byte (bits
0 to 7). If an odd number was specified in the command’s “number of bytes”
parameter, the last byte of read data will contain the leftmost byte of a word.
Code
Area name
Address range
01 (Hex)
IR area
IR 000 to IR 049
02 (Hex)
IR area
IR 200 to IR 227
03 (Hex)
DM area
DM 0000 to DM 2047
04 (Hex)
LR area
LR 00 to LR 15
05 (Hex)
HR area
HR 00 to HR 19
06 (Hex)
AR area
AR 00 to AR 23 (read area only)
07 (Hex)
Timer/Counter area
TC 000 to TC 255
Number of bytes received
Source node number
Service code
Leftmost
byte
Rightmost byte
Read data
(200 bytes max.)
Leftmost byte
Rightmost byte
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