154 | Managing the Radio
Aprisa SR+ User Manual 1.11.1
Bit Oriented
This menu item is only applicable if the serial port has an operating mode of Bit Oriented.
This mode allows support for legacy protocols that are not compatible with standard UARTs. Examples are
VANCOMM, REDAC, CONITEL, and CDC, although others will work as well.
Bit Oriented (Streaming) may be used to reduce latency of BOP. If this mode is selected, an MTU value of 8
is recommended. When streaming mode is used, other traffic is blocked during a BOP packet, so this mode
is only recommended when the radio network is used exclusively for BOP traffic.
The limitations of this mode are:
•
The MTU must be configured larger than the inter-frame gap.
•
The maximum baud rate is 4800 bit/s.
•
The inter-frame gap must be configured to the length of a packet in the protocol being used. Tested
values known to work are:
Protocol
Inter-Frame Gap
VANCOMM
14
REDAC
4
CONITEL
4
CDC TYPE I (at base station)
4
CDC TYPE I (at remote radio)
31
•
Only supported on one serial port at a time.
•
Not supported on a USB serial port.
•
CTS-RTS Flow Control is not supported. The RTS input (RJ45 Pin 1) to Aprisa SR+ must be tied to the
TX input (RJ45 Pin 3).
•
CTS Keying can be 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.
Summary of Contents for Aprisa SR+
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