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Configurable HMI Panel

Installation Guide and User Manual

Page 10 / 16

Serial Interface

Port settings

To communicate via serial interface, the following settings must be used for the Host COM

port:

 38.400 bytes/s

 8 data bytes

 1 stop bit

 no parity

RS232 protocol

For the implementation of a serial connection between the host and keyboard, the

information of the keyboard protocol is necessary. First, an overview of commands is given.

Subsequently, the structure of the data frames and control sequences is defined.

Command definitions

Command Dec Hex Description

START_HOST 170 AA Start of frame (from Host)

START_CONTROLLER 171 AB Start of frame (from µC)

END_IDENTIFIER 204 CC End of frame (both Host+µC)

ACK 240 F0 Acknowledgement

ERROR 242 F2 Error in data frame

CODE_UNKNOWN 243 F3 Unknown command

CODE_LEDi 176 B0 Set LED status

CODE_LEDo 177 B1 Get LED Status

Table 3 - RS232 frame commands

Data frame definition

Within the host/keyboard protocol the following data frames are defined (see

Table

4). The assignment of the LED’s is the same as for the USB protocol and can

be found in

Table 2. The key codes (hex values) are also the same as the Usage ID”s

for the HID keyboard report

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Eao Configurable HMI Panel Bedienungsanleitung Seite 11