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Mitsubishi Programmable Controllers FX-232ADP Manual de usuario Pagina 57

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FX communication
Communication format 6
6-1
6
6. Communication format (D8120)
This chapter explains setting the communication between no protocol communication (RS
instruction) and computer link. For the RS instruction, refer to Section 9. For computer link, refer
to Sections 7 and 8.
6.1 What Is Communication Format?
The communication format decides the communication setting (data length, parity, and baud rate,
etc.) between computer link and no protocol communication (RS instruction).
The communication format can be set using the special data register D8120* in a programmable
controller. Set D8120 in accordance with external equipment used.
After modifying the setting of the D8120, make sure to turn off the power of the programmable
controller, then turn it on again.
* In the FX
2N
, FX
2NC
series, this setting can be performed using parameters.
6.2 Related Flags and Data Registers
6.2.1 Special Auxiliary Relays
( ) indicates the applicable application.
6.2.2 Special Data Registers
( ) indicates the applicable application.
Special auxiliary relays Description
M8121 Data transmission delayed (RS instruction)
M8122 Data transmission flag (RS instruction)
M8123 Finished receiving flag (RS instruction)
M8124 Carrier detection flag (RS instruction)
M8126 Global flag (computer link)
M8127 On-demand handshake flag (computer link)
M8128 On-demand error flag (computer link)
M8129
On-demand word/byte changeover (computer link)
Time out evaluation flag (RS instruction)
M8161 8 bits/16 bits changeover flag (RS instruction)
Special data registers Description
D8120 Communication format (RS instruction, computer link)
D8121 Station No. setting (computer link)
D8122 Number of remaining data to be transmitted (RS instruction)
D8123 Number of receive data (RS instruction)
D8124 Data header <Initial value: STX> (RS instruction)
D8125 Data terminator <Initial value: ETX> (RS instruction)
D8127 On-demand head device register (computer link)
D8128 On-demand data length register (computer link)
D8129 Data network Time-out timer value (RS instruction, computer link)
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