4RF Aprisa LTE, Руководство пользователя

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Managing the LTE | 99
Aprisa LTE User Manual 2.1
Flow Control
This parameter sets the flow control of the serial port. The default setting is Disabled.
Option Function
None The LTE port (DCE) CTS is in a permanent ON (+ve) state.
If router enters sleep state, then CTE goes OFF.
CTS-RTS CTS / RTS hardware flow control between the DTE and the Aprisa
SR+ router port (DCE) is enabled.
The CTS state follows the RTS state.
If the LTE buffer is full or the LTE is in sleep state, the CTS goes
OFF.
CTS-Keying CTS Keying is needed when working with devices that require to be
keyed before sending data;
•
Driving legacy modems that use the CTS signal as a key-up
signal.
•
Driving external RS-485 converters, where the CTS signal is
used as a Tx enable
CTS Delay ms
In CTS-RTS mode, this parameter sets the delay between CTS and RTS. The default setting is 0 ms.
In CTS-Keying mode, this parameter sets the period the between the CTS being set and data being
transmitted. The default setting is 0 ms.
CTS Hold ms
In CTS-Keying mode, this parameter sets the period the between the end of the data and CTS being cleared.
The default setting is 0 ms.
Inter-Frame Gap (chars)
This parameter defines the gap between successive serial data frames. It is used to delimit the serial data
to define the end of a packet.
Smaller values give better serial latency, however if this value is too small then packets may be incorrectly
split and serial speed may be much slower. If this value is too large serial packets may be incorrectly joined
together.
The Inter-Frame Gap limits are 0 to 9999 chars in steps of 0.1 char. The default setting is 3.5 chars.
An alarm event indicates if the value is set larger than the maximum for the serial mode selected.
Terminating Resistor (ohms)
Used for Port Types of RS-422 and RS-485.
When enabled, the RX port, or the TX/RX port for RS-485 half-duplex port is terminated in 120 ohms. The
default setting is disabled.