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Precautions for Safe Use
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CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
• We recommend replacing the Battery with the power turned OFF to prevent the CPU Unit's sensitive
internal components from being damaged by static electricity and to prevent malfunctions. The Bat-
tery can be replaced without turning OFF the power supply. To do so, always touch a grounded piece
of metal to discharge static electricity from your body before you start the procedure.
After you replace the Battery, connect the Sysmac Studio and clear the Low Battery Voltage error.
• Make sure that the required data, including the user program, configurations, settings, variables, and
memory used for CJ-series Units, is transferred to a CPU Unit that was replaced and to externally
connected devices before restarting operation.
Be sure to include the routing tables, network parameters, and other CPU Bus Unit data, which are
stored in the CPU Unit.
• Dispose of the product and Batteries according to local ordinances as they apply.
• The following information must be displayed for all products that contain primary lithium batteries with
a perchlorate content of 6 ppb or higher when shipped to or transported through the State of Califor-
nia, USA.
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate.
• The CPU Unit contains a primary lithium battery with a perchlorate content of 6 ppb or higher. Place
the above information on the individual boxes and shipping boxes when shipping finished products
that contain a CPU Unit to the State of California, USA.
• When connecting RS-422A/485, always check the polarity before you make connections. The signal
names SDA/B and RDA/B do not always have the same polarity.
• Do not turn OFF the power supply while writing the protocol macro data.
• Do not connect the 5-V power supply on pin 6 of the RS-232C port on the Unit to any external device
other than an NT-AL001 Link Adapter. Otherwise, the external device and the Serial Communications
Unit may be damaged.
• Use the OMRON Cables specified in this manual or make your own cables. Do not use commercially
available RS-232C cables sold for personal computers. Otherwise, the external device and the Serial
Communications Unit may be damaged.
• When the Serial Gateway is executed during protocol macro execution, the communications
sequence contents and the command reception timing may suspend step transition of the communi-
cations. Use the Serial Gateway send start timeout function to monitor at the command source
whether step transition in the communications sequence was suspended due to execution of Serial
Gateway. If sending of he command of each protocol does not start within the set time, either retry
execution of the command or change the communications sequence.
• When you use 2-wire RS-422A/485 communications in Protocol Macro Mode, set only modem con-
trols for the transmission control parameters, and do not use RS/CS flow controls.
• An instruction error will occur if you execute the SerialSend, SerialRcv, or SerialRcvNoClear instruc-
tion for a serial communications port that is in any mode other than No-protocol Mode.
Unit Replacement
Disposal
Using Serial Communications Unit