Managing the Radio | 153
Aprisa SR+ User Manual 1.11.1
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.
Flow Control
This parameter sets the flow control of the serial port. The default setting is Disabled.
Option
Function
None
The Aprisa SR+ radio port (DCE) CTS is in a permanent ON (+ve)
state.
If radio enters sleep state, then CTE goes OFF.
CTS-RTS
CTS / RTS hardware flow control between the DTE and the Aprisa
SR+ radio port (DCE) is enabled.
The CTS state follows the RTS state.
If the Aprisa SR+ buffer is full or the Aprisa SR+ 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 RS485 serial links, where the CTS signal is used as a Tx
enable
•
Used to enable interfacing between SR+ running bit-oriented
protocol with an OSI MEU device. The CTS signal is wired to the
OSI MEU CD input in this case, as the MEU uses the CD as a
receiver enable signal in bit-oriented mode.
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 Duration 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.
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