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4 Using Protocol Macros
4-40
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
4-3 Using Protocol Macros
Use the ExecPMCR instructions to execute communications sequences.
The ExecPMCR instruction is supported by the NJ-series CPU Unit. For details on the ExecPMCR
instruction, refer to the NJ-series Instructions Reference Manual (Cat. No. W502).
When a ExecPMCR instruction is executed, the communications sequence specified in SeqNo is exe-
cuted from the serial port (physical port) of the device with the unit number specified in Port.
At first, define the send data array SendData[] and receive data array RecvData[] as user-defined vari-
ables, and send the send data stored following SendData[1] for the number of words specified in Send-
Data[0]. The receive data is stored following RecvData[1]. The number of elements in the receive data
is stored in RecvData[0].
If reception processing fails, the data following RecvData[1] (the number of words specified in Recv-
Data[0]) specified before execution of the ExecPMCR instruction, is read from the reception buffer and
stored again following RecvData[1]. This ensures that the current data will not be cleared to 0 and that
the previous receive data will be maintained when receptions fail.
z
Port (Port Specification)
Specifies the port at which communications sequences are to be executed using a _sPORT (struc-
ture) variable.
z
SeqNo (Communications Sequence No.)
Specifies the communications sequence No. (000 to 999) in decimal numbers.
4-3-1 Executing Communications Sequences
ExecPMCR Instruction Specifications
Variable Name Details
Data
type
Valid range
Factory
setting
Port Destination Port
Specification Destination Port Spec-
ification _sPORT --- ---
UnitNo Unit Number Unit number of Serial
Communications Unit _eUnitNo _CBU_No00 to
_CBU_No15 _CBU_No00
PhysicPortNo Serial Port No. Serial port number of
Serial Communica-
tions Unit USINT 1, 2 1
ExecPMCR
Execute Done
Port
Busy
SeqNo Error
SrcDat
ErrorID
DstDat
ErrorIDEx
DstDat
Execute Execution conditions
Port Port specification
SeqNo Communications sequence No.
SrcDat Send data array starting element
DstDat Receive data array starting ele-
ment