Chapter Five
Specifications
Man_805U Rev 1.8
Page
29
Chapter Four
CONFIGURATION
4.1
Before Configuring
Configuration comprises selecting parameter values for the operation of the 805U unit. Four
pre-set configurations may be achieved using the four DIP switches. These configurations
cover most applications - refer section 4.7.
Before you start configuration, parameter settings must be decided. The main parameters
are:-
•
Addressing - system address, group address, unit address.
•
Character type. You need to find out the character type of the host devices connected to
the 805U units. The most common character type is 8 data bits, no parity, 1 start bit and
1 stop bit.
•
Serial Data Rate. You need to find out the serial data rate used by the host devices. It is
possible to have different serial rates configured at different modules in the same system.
•
Radio Data Rate. You need to decide what radio data rate you wish to use. It does not
have to be the same as the serial data rate. Remember that the radio range for 76800 and
38400 bits/sec will not be as good as that for 19200. We recommend that you use 19200
bits/sec unless your application requires the faster data rate.
•
Operating mode . You need to decide which operating mode you wish to use. Modes are
transparent or controlled (auto-connect, single-connect, low power mode), error-checked
or no-error-check,. These modes are discussed in more detail in following sections.
The other configuration parameters do not need to be selected, and are provided as a means
of "fine tuning" the operation of the 805U units.
Configuration may be achieved by three different methods:
1.
Using a Windows configuration program run on a PC. This is the most common way of
configuring.
2.
Using Hayes AT commands. This method can be performed manually by the user from a
PC terminal (for example, Hyperterminal), or can be performed automatically by the
host device.
3.
Using the four DIP switches located in the end-plate of the module. It is not possible to
select addressing using these switches, so these switches are normally used as a quick way
to try other configuration modes or data rates.
4.2
Addressing
A 805U network comprises modules with the same "system" address. The system address is
a 8 bit value (values 0 to 255). Only modules with the same system address will communicate
with each other. If you are adding another module to an existing system, use the same value
as the existing modules. If you are starting a new system, select random values and use the
same value for each module.
