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8.10. Changing the RS-485 Communication Speed
The unit's RS-485 communication speed is preset to 115200 bps by the factory. To increase the cable distance,
decreasing the communication speed permits highly-reliable transmissions. It is recommended that the
communication speed be changed when the cable length exceeds 100 m.
Cautions
• Decreasing the communication speed also slows down the unit's response to the instructions from a PC.
• Change the communication speed only at the master unit.
Follow the procedures below to change the communication speed:
Step 1. Shift the System Lock switch to the left to disable the
System Lock function.
Step 2. Press and release the Reset key while holding down
the Unit ID Number Display key.
Step 3. Release the Unit ID Number Display key when the
"Co" indication is displayed on the Memory/Unit ID
Number display.
Step 4. The following indications flash on the display to show
the current communication speed setting:
[CH]: 115200 bps
[C3]: 38400 bps
[C2]: 19200 bps
[C1]: 9600 bps
Step 5. Select the communication speed using the
Memory/Unit ID Number Selector key.
Step 6. Press the Memory Recall key to set the selected
speed.
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