User manual

Chapter Four Configuration
Page 37 © January 2011
however it can also be used for single-connect.
In fast operation mode, the master and slave modules continually communicate with each other
(even if there is no data) to minimize radio
synchronizing time when data is to be
transmitted.
You cannot use repeaters when using the
option. Unit address should be less than 15.
Low Power Mode
If “Low Power Mode” is selected, the
module will disconnect the communications
link and shutdown its receiver circuits if the
RS232 DTR signal goes to a low or reset
state. When the DTR signal becomes high or
active, then the module will revert to normal
operation.
Controlled Mode Options
For each controlled mode, there are some options. In the “Advanced” page, there are some
timing parameters.
If you enter a “Link Check Time”, then the master unit will
send a “check message” if the check time has elapsed without
any data transmissions. For example, if you enter 10 seconds,
then if there is a 10 second period without a data transmission,
then the master module will transmit a check message. If the
slave does not acknowledge, then the master will transmit the
check message up to five times. If there is still no ACK, then
the link will be reset (DCD reset).
If you enter an “Inactivity Timeout” value, then the 805U will
automatically reset the link if there has been no data
transmissions within this time. If you use the link check
feature, you should enter an “Inactivity Timeout” value to
reset the link at the slave unit.
It is a good idea to use these timers as it provides a higher level
of security for the controlled mode system (except for “fast
operation” systems). Normally a link check time will be
entered at the master unit (for example, 10 seconds), and a
inactivity timeout will be entered at the slave unit (for example,
15 seconds). It is important that the inactivity timeout is greater
than the link check time.
A value of zero disables these parameters.