Communication Format (D8120); What Is Communication Format; Related Flags And Data Registers; Special Auxiliary Relays - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

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
6.2

Related Flags and Data Registers

6.2.1

Special Auxiliary Relays

Special auxiliary relays
M8121
M8122
M8123
M8124
M8126
M8127
M8128
M8129
M8161
( ) indicates the applicable application.
6.2.2

Special Data Registers

Special data registers
D8120
D8121
D8122
D8123
D8124
D8125
D8127
D8128
D8129
( ) indicates the applicable application.
, FX series, this setting can be performed using parameters.
2NC
Data transmission delayed (RS instruction)
Data transmission flag (RS instruction)
Finished receiving flag (RS instruction)
Carrier detection flag (RS instruction)
Global flag (computer link)
On-demand handshake flag (computer link)
On-demand error flag (computer link)
On-demand word/byte changeover (computer link)
Time out evaluation flag (RS instruction)
8 bits/16 bits changeover flag (RS instruction)
Communication format (RS instruction, computer link)
Station No. setting (computer link)
Number of remaining data to be transmitted (RS instruction)
Number of receive data (RS instruction)
Data header <Initial value: STX> (RS instruction)
Data terminator <Initial value: ETX> (RS instruction)
On-demand head device register (computer link)
On-demand data length register (computer link)
Data network Time-out timer value (RS instruction, computer link)
Description
Description
Communication format 6
6-1
6