3. Instructions
920
CS/CJ/NSJ Series Instructions Reference Manual (W474)
z Explicit Message Instructions
The following instructions, which are used specially for explicit messages, are called Explicit Message
Instructions.
z Features of Explicit Message Instructions
• This enables easily reading and writing data between CPU Units using explicit message
communications.
• With the EXPLICIT GET/SET ATTRIBUTE instructions, entering the service code is not required and
only information from the class ID onward needs to be entered.
• With the EXPLICIT WORD READ/WRITE instructions, the I/O memory address in the local and
remote CPU Units can be specified directly.
Code specifications for area types and hexadecimal word addresses are not required. (These are
required for CMND(490) or CMND2(493) instructions with service code 1E hex (word data read) or
1F hex (word data write).)
z Operation
Explicit Communications Error Flag is used to determine if communications ended normally or in error.
For error completions (i.e., when the flag is ON), the Communications Port Error Flag for FINS
commands is used to determine if the explicit message was never sent (i.e., when the flag is ON) or if
there was an error in the explicit message that was sent (i.e., when the flag is OFF).
The Communications Port Completion Code will contain 0000 hex after a normal end, an explicit
message error code after an explicit communications error end, and a FINS message completion code
after a FINS error end.
Mnemonic Instruction Name Outline
EXPLT (720) EXPLICIT MESSAGE SEND Sends an explicit message with any service code.
Note Functionally, this instruction is the same as sending CMND(490) or CMND2(493)
with a FINS command code of 2801 hex.
EGATR (721) EXPLICIT GET ATTRIBUTE Sends an explicit message with a service code of 0E hex (GET ATTRIBUTE SINGLE).
ESATR (722) EXPLICIT SET ATTRIBUTE Sends an explicit message with a service code of 10 hex (SET ATTRIBUTE SINGLE).
ECHRD (723) EXPLICIT WORD READ Uses an explicit message to read data from a CPU Unit.
ECHWR (724) EXPLICIT WORD WRITE Uses an explicit message to write data to a CPU Unit.
Condition
Explicit Communications
Error Flag
(A213.00 to A213.07: Com-
munications ports 0 to 7)
Communications Port
Error Flag
(A219.00 to A219.07: Com-
munications ports 0 to 7)
Communications Port
Completion Code
(A203 to A210: Communica-
tions ports 0 to 7)
1) Normal end OFF OFF 0000 hex
2) Error end a) When the explicit message
could not be sent
ON ON FINS messages completion
code
b) When the explicit message was
sent but an explicit error response
was returned
OFF Explicit message error code
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