Nt-Al001 Link Adapter Settings - Omron CJ1W-SCU32 Operation Manual

3 Installation and Wiring
Precautions for Correct Use Precautions for Correct Use
• Use the same transmission circuit (2-wire or 4-wire) for all nodes.
• Do not use 4-wire connections when the 2/4-wire switch on the Unit is set to 2-wire.
• In Protocol Macro Mode, do not use full-duplex transmissions when the 2/4-wire switch on the
Unit is set to 2-wire. Otherwise, the data sent from the Serial Communications Unit will be
directly returned as receive data. In this case, the Unit cannot determine whether the data in
the reception buffer is its own send data or the data received from a remote node, and thus
cannot perform receive processing properly. To avoid this problem, always use half-duplex
transmissions with a 2-wire setting. You can use either half-duplex or full-duplex transmissions
with a 4-wire setting.
3-2-8

NT-AL001 Link Adapter Settings

The NT-AL001 Link Adapter has a DIP switch to set RS-422A/485 communications conditions. When
you connect the Unit in any serial communications modes, refer to the DIP switch settings shown in the
following table.
Pin
1
2
3
4
5
6
3-8
Function
Not used. Always set this pin to ON.
Built-in terminating resistance setting
ON: Connects terminating resistance.
OFF: Disconnects terminating resistance.
2/4-wire setting
2-wire: Set both pins to ON.
4-wire: Set both pins to OFF.
Transmission mode (setting)
Constant transmission: Set both pins to OFF.
Transmission performed when CS signal in RS-
232C interface is at high level: Set pin 5 to OFF
and pin 6 to ON.
Transmission performed when CS signal in RS-
232C interface is at low level: Set pin 5 to ON
and pin 6 to OFF.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Factory
setting
ON
ON
OFF
OFF
ON
OFF