Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

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20 SERIAL COMMUNICATION INSTRUCTIONS
20.2 Executing the Protocols Registered for the Predefined Protocol Support Function
• After the protocol whose communication type is "Send and receive" is canceled, clear the receive data.
When data is received after cancellation, the receive data is held in the OS area (receive data area). This
occurs when a response from the external device is slow. For how to clear receive data, refer to Page 1702
Clearing Receive Data.
• While the value set to "Protocol cancellation specification" is 1 (Cancellation requested), another
G(P).CPRTCL instruction cannot be executed.
■
Special protocol
The following functions are available by executing special protocols with the G(P).CPRTCL instruction.
In control data (s)+2 to (s)+9 of the G(P).CPRTCL instruction, specify the number of the special protocol of the function to be
executed.
*1 When a special protocol is executed, the keyword is defined as the character string that is stored in the protocol name of the protocol
execution history.
Precautions
• The following table summarizes the processes that take place if another instruction is issued while the G(P).CPRTCL
instruction is active or the G(P).CPRTCL instruction is issued while another instruction is active with the same channel.
*2 The following instructions are not available with the same channel as for the G(P).CPRTCL instruction because they use a
communication protocol different from the one used by this instruction. In addition, if these are used with the same channel as for the
G(P).CPRTCL instruction, a communication protocol setting error (7FF2H) will occur (except for the Z.BUFRCVS instruction).
• The local device and the file register for each program are not available for setting data.
Functions Description
Clearing receive data Enables the receive data to be cleared from the OS area.
Send/receive data monitoring start/stop Specifies the start or stop of send/receive data monitoring.
When special protocols 202 or 203 is executed, the module sets the monitor start instruction "0001H" or the
monitor stop instruction "0000H" for the send/receive data monitoring specification (address: 2018H, 2118H).
RS/DTR signal status specification Specifies the on/off state of the RS(RTS) and ER(DTR) signals.
When one of special protocols 204 to 207 is executed, the module turns on/off the bit corresponding to the RS/
DTR signal status specification (address: 92H/132H).
For details on the RS/DTR signal status specification, refer to the following.

MELSEC iQ-R Serial Communication Module User's Manual (Application)
Functions Special protocol
number Type Keyword
*1
Clearing receive data 201 Clearing receive data Receive Data Clear
Send/receive data
monitoring start/stop 202 Start send/receive data monitoring Send/Recv Monitor Start
203 Stop send/receive data monitoring Send/Recv Monitor Stop
RS/DTR signal status
specification 204 Turn on the ER (DTR) signal DTR ON
205 Turn off the ER (DTR) signal DTR OFF
206 Turn on the RS (RTS) signal RS ON
207 Turn off the RS (RTS) signal RS OFF
Instruction to execute
concurrently
*2
Possibility of
concurrent execution Handling for concurrent execution
G(P).CPRTCL  The instruction is ignored and does not start processing until the active instruction
completes.
Concurrent execution is, however, possible if they use different channels.
G(P).PUTE
 
G(P).GETE
G(P).SPBUSY
ZP.UINI

A dedicated instruction concurrent execution error (7FF0H) occurs in the second
instruction.
• G(P).ONDEMAND, G(P).OUTPUT, G.INPUT, G(P).BIDOUT, G(P).BIDIN, Z.BUFRCVS, G(P).PRR, and ZP.CSET instructions