Used to set parameters related to the device's two serial ports. COM1 is RS-232 only and COM2 is RS-232 and RS-485.
These are the most often used set of serial parameters.
Baud Rate | Baud rate in bits per second (bps). Most common is 9600 bps. |
Parity | Type of parity. N = no parity, O = odd parity, E = even parity. Most common is 'N'. |
Data | Number of data bits. Most common is 8. |
Stop | Number of stop bits. Most common is 1. |
Each port has the same set of parameters arranged in a row. The exceptions are COM0 and COM2. COM0 does not have RTS keying. COM2 has RS-485 whereas the other serial ports do not.
EoT Delay | Delay in milliseconds used to mark the end of a transmission. Modbus standard is 3.5 character times or approximately 4ms at 9600 baud. |
RTS Keying | Used to enable and disable flow control. |
Key Delay | Milliseconds of key delay to wait prior to sending the message. |
RS-485 | There are two COM2 serial ports on the RIO. One supports RS-232 and the other supports RS-485. This option is used to enable RS-485 two wire or four wire. If 'NONE' is selected the RS-485 serial port is not enabled and only the RS-232 port can be used. The RS-232 port is always enabled and can be used even when RS-485 is disabled. |