RS-422/485 isolated x 2
Specifications
By factory default, the RS-485 interface is connected on the interface cartridge. Depending on your requirements, you can change the interface to a RS-422 interface included with the product.
Asynchronous transmission | RS-422 (isolated) x 2, RS-485 (isolated) x 2 |
Data length | 7 or 8 bits |
Stop bit | 1 or 2 bits |
Parity | None, odd or even |
Flow control | xon/xoff control |
Data transmission speed | 2,400...115,200 bps |
Connector | D-Sub 9 pin (plug) |
Power consumption (max.) | 0.58 W |
The serial interface is isolated. The SG (signal ground) and FG (frame ground) terminals are not connected inside this product. When the serial interface connector is D-Sub, connect the FG wire to the shell.
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ELECTRIC SHOCK AND FIRE
When using the SG terminal to connect an external
device to this product:
Failure to follow these instructions will result in death or serious injury.
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LOSS OF COMMUNICATION
Failure to follow these instructions can result in injury or equipment damage.
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NOTICE |
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BROKEN ENCLOSURE
Do not exert more torque than the amount specified.
Failure to follow these instructions can result in equipment damage.
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Pin No. | RS-422 | ||
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Signal name | Direction | Description | |
1 | TxD- | Output | Send data – |
2 | TxD+ | Output | Send data + |
3 | RxD- | Input | Receive data – |
4 | RxD+ | Input | Receive data + |
5 | SG | — | Signal ground (isolated) |
6 | NC | — | No connection |
7 | NC | — | No connection |
8 | NC | — | No connection |
9 | NC | — | No connection |
Shell | FG | — | Frame ground |
Pin No. | RS-485 | ||
---|---|---|---|
Signal name | Direction | Description | |
1 | Data– | Input/Output | Communication data – |
2 | Data+ | Input/Output | Communication data + |
3 | NC | — | No connection |
4 | NC | — | No connection |
5 | SG | — | Signal ground (isolated) |
6 | NC | — | No connection |
7 | NC | — | No connection |
8 | NC | — | No connection |
9 | NC | — | No connection |
Shell | FG | — | Frame ground |
For both RS-422 and RS-485:
Recommended jack screw is #4-40 (UNC).
Replacing with RS-422
- Use a box wrench (5 mm) to remove the screws on the interface.
- Disconnect the interface connector from the cartridge, and also disconnect the cable connected to the board.
- As shown below, attach the cable connector so that the cable’s red wire is at position 1. Attach so that the port with the red wire is on side B.
- Insert the RS-422 interface connector into the cartridge and tighten the screws.
Termination Resistor Setting
Termination resistor setting is necessary when using RS-422/485 isolated x 2. Set up by referring to the following table.

Dip SW | OFF | ON | Port |
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1 | Normal | Termination | For RS-422 (port identified with a red wire) |
2 | Normal | Termination | For RS-422 (port not identified with a red wire) |
3 | Normal | Termination | For RS-485 (port identified with a red wire) |
4 | Normal | Termination | For RS-485 (port not identified with a red wire) |