### Setting of External Device

Setting of External Device includes the setting with parameter and the setting by writing data to the special data register.

##### Setting with parameter

Double-click [PC parameter] from [Parameter] in the tree view of the ladder software to display the [FX parameter] dialog box.

Click the [PC system settings (2)] tab for communication settings.

IMPORTANT:

- FX0N does not support the setting with parameter. Select the setting by writing data to the special data register.

Setup items and description are shown below.

Setup Items | Setup Description
--- | ---
CH*1 | CH1 or CH2
Protocol | Protocol communication only
Data Length | 7
Parity | Even
Stop Bit | 2
Line Speed | Match with the speed of Display
Header | None
Terminator | None
H/W Type | Normal/RS232C
Sum Check | Added
Control method | Form 4
Timeout | 1

*1Setting only for FX3UC, FX3U, FX3G and FX3GC.

##### Setting by writing data to the special data register

Write data to the data register of External Device. After writing, turn the power of External Device from OFF to ON.

IMPORTANT:

- When using the FX0N Series, turn ON M8120 for keeping communication settings before turning power from OFF to ON.

Write destination data register and write data are shown below.

Write Destination Data Register | Write data
--- | ---
CH1 of FX3UC, FX3U, FX3G, FX3GC and FX Series except above | CH2 of FX3UC, FX3U, FX3G and FX3GC
D8120 | D8420 | 0xE89E
D8121 | D8421 | 0
D8129 | D8429 | 1

NOTE

- System version 1.20 or higher for FX0N is required. You can monitor the special register D8001 to check the system version for External Device. Please refer to the manual of External Device for more details.
- System version 1.06 or higher for FX2N is required. You can monitor the special register D8001 to check the system version for External Device. Please refer to the manual of External Device for more details.
- When using FX3UC-32MT-LT(-2) / FX3U, simultaneous communication of Ch1 and Ch2 is available.
- When using FX3U-232ADP which is connected to FX3U-***ADP, Ch2 is assigned to FX3U-232ADP.