Kenwood NEXEDGE NX-200 Function Reference page 468

18 DATA COMMUNICATION FUNCTIONS
18.5 Transparent
Data Preamble Extension Time
The data exceeding 80 bytes can be divided into 80-byte Data Blocks and the blocks can be sent over the Air in data
communications using Transparent.
In this case, Preamble, such as 0xAA, 0xAA, ... can be entered between Data Blocks. This extended time is called Data
Preamble Extension Time.
Preamble (0xAA, 0xAA, ...) is sent out for the amount of time configured for Data Preamble Extension Time.
The transceiver occupies the channel to transmit over the Air once the transceiver starts sending data in data
communications using Transparent. This parameter can be used to reliably and quickly send data without receiving an
acknowledgment sent over the Air.
Note
• This function is applicable only if the transceiver is using FleetSync data communications.
• The configuration value for Maximum ACK Wait Time needs to be configured to be larger than the total configuration value for Data
Preamble Extension Time and Data Transmit Modulation Delay Time.
Configuration using KPG-111D/ DN
Configuring the Data Preamble Extension Time (
Transparent Header
Transparent Header is the function to send the Kenwood proprietary sentence to an application which is used during data
communications using Transparent.
The Header is sent for data sent first. Transparent Data is sent after sending the Header.
The application software may be able to recognize from where the data is sent by analyzing this Header information.
Configuration using KPG-111D/ DN
Configuring the Transparent Header (
COM port Priority
The transceiver can make data communications if "Data", "Data + GPS Data Output", "Transparent", or "Transparent 2
(NXDN)" is assigned to its communication port. COM port Priority can be used to improve the reliability of the
communication between a PC and the transceiver.
Configuration
Transparent Data sent from a PC has the higher priority level.
Serial Data If the PC that is connected using a serial port sends Transparent data while the transceiver is receiving data over the
Air, the transceiver stops receiving data over the Air and then immediately start sending Transparent data.
Receiving over the Air has the higher priority level.
Receiving Data If the PC that is connected using a serial port sends Transparent data while the transceiver is receiving data over the
Air, the transceiver does not send Transparent data until the transceiver completes receiving data over the Air.
Note
Serial Data cannot be prioritized for a zone in an NXDN Trunking system. In a zone in an NXDN Trunking system, the transceiver
functions in the same manner as if "Receiving Data" is configured for COM port Priority, even if "Serial Data" is configured for COM port
Priority.
Configuration using KPG-111D/ DN
Configuring the COM port Priority (
FUNC (K)/Ver 4.00
See FPRG 8.16.4 Parameter Tab)
See FPRG 8.10.6 Common Page 4 Tab)
Table 18-2 COM port priority
Description
See FPRG 8.10.3 Common Page 3 Tab)
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