User's Manual
760 Mhz Data Transceiver Users Manual
LUM0000XX Rev A Version 1.0 14
Serial Interface
In products for which the protocol of the data port is software selectable, use this
menu to set the protocol of the data port. In the TTL RF board product this setting
must be "0".
Menu Protocol Additional Information
0 RS232 Also used for TTL transceivers.
1 RS422 Modbus RTU mode must be enabled. See above.
2 RS485 Modbus RTU mode must be enabled. See above.
3 DOT Special for the Department of Transportation.
Note: When DOT mode is enabled, the TimeDelay settings operate the same as
in the RS485/422 mode.
Note: RS4xx mode must have Modbus RTU enabled, and TurnoffDelay set to at
least 4.
Setup Port
Note: DO NOT change this setting unless the correct programming cable is
available for the new setting.
This setting determines which port, Main or Diagnostics, is used to enter the Setup
Main Menu.
Menu Port Additional Information
1 Main Only The terminal is connected to the Main Data Port.
2 Diagnostics Only The terminal is connected to the Diagnostic Port.
3 Both Ports The terminal may be connected to either port.
Setup mode is invoked by sending a "U" (capital) to the Diagnostics port or by
pressing/toggling the Set-up button/switch, if available. OEM boards may also
enter Setup when Pin 2 is grounded.
The Main Data Port is the RS232 port. The OEM modules use a 2-row, 2 mm
female connector. The diagnostic cable for this port (ASC2009DC) is available
from FreeWave.
TurnOn/OffDelay
TurnOnDelay- Sets the delay between when the line drivers are turned on and
when the data leaves the data port. This setting can be adjusted for a 1-9 mS
delay.
TurnOffDelay- This setting specifies the time after the end of transmission of a
character to the RS485 bus that the transceiver stops driving the bus and releases
the bus to other devices. The units are ΒΌ of a character with a range of 0-9. An
entry of 4 means a delay equivalent to the duration of a full character. Default is
zero delay.
For data rates of 1200 bits/S or slower, avoid setting the TurnoffDelay parameter
higher than 4. At those rates the functionality of the microprocessor changes so
that a TurnoffDelay of 5 will have the same effect as if set to 1, and a setting of 6
will have the same effect as 2, and so on.
Note: TurnOffDelay must be set to a value of at least 4 for RS4xx operation.