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The USB (virtual COM) interface settings for the communication port are as follows:
BAUDRATE: 115200
PARITY: NONE
DATA BITS: 8
STOP BIT: 1
FLOW CONTROL: NONE
4.2 Device States
The device may be in one of the two possible states described below.
4.2.1 Local State (LOCS)
In the LOCS state, the device may be operated from the front panel.
4.2.2 Remote State (REMS)
In the REMS state, the device may be operated from the USB interface. Actuating any front panel key
will cause the device state to revert to the LOCS.
4.3 Message Exchange Protocol
The device decodes messages using the Message Exchange Protocol similar to the one defined in IEEE
488.2. The following functions implemented in the MEP must be considered:
4.3.1 The Input Buffer
The device has a 128-byte long cyclic input buffer. Decoding of remote messages is begun as soon as
the input buffer is not empty, that is, as soon as the controller has sent at least one byte to the device.
Should the input buffer be filled up by the controller faster than the device can remove the bytes and
decode them, the bus handshake (CTS/RTS) is used to pause data transfer until room has been made
for more bytes in the buffer. This prevents the controller from overrunning the device with data.
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