LabJack U3 - Asynchconfig

5.3.16 AsynchConfig
Requires U3 hardware version 1.21. Configures the U3 UART for asynchronous
communication. The UART uses SDA for TX (transmit) and SCL for RX (receive).
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.
• AsynchOptions: If Update is true, the new parameters are written (otherwise just a read
is done). If UARTEnable is true, the UART is enabled and the RX line will start buffering
any incoming bytes.
• BaudFactor8: This 8-bit value sets the baud rate according the following formula:
BaudFactor8 = 2^8-TimerClockBase/(Desired Baud). For example, if TimerClockBase is
the default of 48 MHz, a baud rate of 9800 bps is not possible. If TimerClockBase is 1
MHz, then BaudFactor8 = 154 provides a baud rate of 9800 bps.
Command:
Byte
0 Checksum8
10xF8
20x02
30x14
4 Checksum16 (LSB)
5 Checksum16 (MSB)
60x00
7 AsynchOptions
Bit 7: Update
Bit 6: UARTEnable
Bit 5
: Reserved
8 Reserved
BaudFactor8
se:
9
Respon
Byte
0 Checksum8
0xF8
0x02
1
2
30x14
4 )
5
6
7 AsynchOptions
8 Reserved
9 BaudFactor8
Checksum16 (LSB
Checksum16 (MSB)
Errorcode
108