Serial Interfaces COM1/COM2ΒΆ
Serial Interface COM1
The serial interface COM1 is connected to a removable 9-pin terminal block. It is configurable for RS-232 and RS-485 and can be used (depending on the processor module) for:
- Online access (RS-232 programming interface for Automation_Builder)
- A free protocol
- MODBUS RTU, client and server
- CS31 system bus (RS-485), as master only CS31 system bus
Pin assignment
| Pin | Signal | Interface | Description | ||
|---|---|---|---|---|---|
Terminal block removed |
Terminal block inserted |
1 | Terminator P | RS-485 | Terminator P |
| 2 | RxD/TxD-P | RS-485 | Receive/Transmit, positive | ||
| 3 | RxD/TxD-N | RS-485 | Receive/Transmit, negative | ||
| 4 | Terminator N | RS-485 | Terminator N | ||
| 5 | RTS | RS-232 | Request to send (output) | ||
| 6 | TxD | RS-232 | Transmit data (output) | ||
| 7 | SGND | Signal Ground | Signal Ground | ||
| 8 | RxD | RS-232 | Receive data (input) | ||
| 9 | CTS | RS-232 | Clear to send (input) | ||
Attention
:strong:Unused connector!
Make sure that the terminal block is always connected to the terminal base, even if you do not use the interface.
Serial Interface COM2
The serial interface COM2 is connected to a 9-pin D-sub connector. It is configurable for RS-232 and RS-485 and can be used (depending on the processor module) for:
- Online access (RS-232 programming interface for Automation_Builder)
- A free protocol
- MODBUS RTU, client and server
COM2 is not intended to establish a CS31 system bus.
Note
TB5x3-2ETH terminal bases have no COM2 D-sub connector.
Pin assignment
| Serial Interface | Pin | Signal | Interface | Description | |
|---|---|---|---|---|---|
| 1 | FE | - | Functional earth | ||
| 2 | TxD | RS-232 | Transmit data | Output | |
| 3 | RxD/TxD-P | RS-485 | Receive/Transmit | Positive | |
| 4 | RTS | RS-232 | Request to send | Output | |
| 5 | SGND | Signal ground | 0 V supply out | ||
| 6 | +5 V | - | 5 V supply out | ||
| 7 | RxD | RS-232 | Receive data | Input | |
| 8 | RxD/TxD-N | RS-485 | Receive/Transmit | Negative | |
| 9 | CTS | RS-232 | Clear to send | Input | |
| Shield | FE | - | Functional earth | ||
Attention
:strong:Risk of corrosion!
Unused connectors and slots may corrode if XC devices are used in salt-mist environments.
Protect unused connectors and slots with TA535 protective caps for XC devices TA535: Protective Caps TA535 for XC Devices TA535 - Protective Caps for XC Devices.