Control command configures the UE9 UART for asynchronous communication.
The UE9 has a UART available that supports asynchronous serial communication. The UART connects to the PIN2/PIN20 (TX0/RX0) pins on the DB37 connector.
Communication is in the common 8/n/1 format. Similar to RS232, except that the logic is normal CMOS/TTL. Connection to an RS232 device will require a converter chip such as the MAX233, which inverts the logic and shifts the voltage levels.
This serial link is not an alternative to the USB connection. Rather, the host application will write/read data to/from the UE9 over USB, and the UE9 communicates with some other device using the serial protocol. Using this serial protocol is considered an advanced topic. A good knowledge of the protocol is recommended, and a logic analyzer or oscilloscope might be needed for troubleshooting.
Table 5.3.17-1. AsynchConfig Command Response
| Command: | ||
| Byte | ||
| 0 | Checksum8 | |
| 1 | 0xF8 | |
| 2 | 0×02 | |
| 3 | 0×14 | |
| 4 | Checksum16 (LSB) | |
| 5 | Checksum16 (MSB) | |
| 6 | 0×00 | |
| 7 | AsynchOptions | |
| Bit 7: Update | ||
| Bit 6: UARTEnable | ||
| Bit 5: Reserved | ||
| 8-9 | BaudFactor16 | |
| Response: | ||
| Byte | ||
| 0 | Checksum8 | |
| 1 | 0xF8 | |
| 2 | 0×02 | |
| 3 | 0×14 | |
| 4 | Checksum16 (LSB) | |
| 5 | Checksum16 (MSB) | |
| 6 | Errorcode | |
| 7 | AsynchOptions | |
| 8-9 | BaudFactor16 |