Basic Function Principles

The KL6011 serial interface terminal allows the connection of devices with a 20 mA current loop. Data can be exchanged with the controller in full duplex mode, independent of the higher-level bus system. The receive buffer has 128 bytes, the transmit buffer 16 bytes. The data transfer between terminal and controller is handled via a handshake in the status and control byte. The factory setting of the terminal is 9600 baud, 8 data bits, 1 stop bit, no parity.

LED display

The Run LED indicates the operating state of the terminal.

On - normal operation
Off - Watchdog timer overflow has occurred. If no process data is transmitted from the Bus Coupler for 100 ms, the green LED goes out.
The TxD and RxD LEDs indicate the states of the signal lines.

Alternative output format for process data

In the alternative output format, 4 or 5 bytes are mapped in the Bus Coupler (3 bytes for data and 1 or 2 control/status byte(s)). The KL6011 is delivered in the alternative format. The mapping of the terminal in the alternative format is described in more detail in the chapter Terminal configuration.

Standard output format for process data

In the standard output format, 4 bytes are mapped in the Bus Coupler (3 bytes for user data and 1 control/status byte). By changing the parameters of the KL6011, up to 5 bytes of user data can be transferred.

Reference

The chapter on "Access from the user program" contains an overview of possible mapping configurations, depending on the configurable parameters.