4RF Aprisa LTE, Руководство пользователя

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98 | Aprisa LTE User Manual
Port Type
This parameter defines the mode of operation of the serial port. The default setting is Standard.
Option Function
RS-232 RS-232 provides asynchronous communication between two devices
over unbalanced TX, RX and control lines.
It defines signals connecting between a DTE such as a computer
terminal, and a DCE, such as a modem
RS-422 RS-422 only offers one-way high speed and/or long distance data
transmission. A single transmitting (master) device to up to 10
receiving (slave) devices. This is dependent on the wire type, baud
rate, distance etc.
Two-way communication requires two pairs, one for each
direction.
RS-485 Half Duplex RS-485 half duplex provides multi-drop two way communication
between a master device and up to 32 slave devices on a 2 wire
bus.
With Half Duplex, data can only pass in one direction at a time to
and from the devices. A 120 ohm termination is required at the
end of the bus pair.
RS-485 Full Duplex RS-485 full duplex provides multi-drop two way communication
between a master device and up to 32 slave devices on a 4 wire
bus.
With Full Duplex, data can pass simultaneously both to and from
the devices. A 120 ohm termination is required at the end of each
pair of the bus.
MTU Size (bytes)
This parameter sets the size of the packet in bytes received before it is transmitted if an inter-frame gap is
not detected. Setting a smaller Maximum Transmission Unit (MTU) may reduce latency, but this should only
be done if the serial protocol is known to allow gaps at the receiver. The default setting is 512 bytes.
Baud Rate (bit/s)
This parameter sets the baud rate to 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115200 bit/s.
The default setting is 9600 bit/s.
Character Length (bits)
This parameter sets the character length to 7 or 8 bits. The default setting is 8 bits.
Parity
This parameter sets the parity to Even, Odd or None. The default setting is None.
Stop Bits (bits)
This parameter sets the number of stop bits to 1 or 2 bits. The default setting is 1 bit.