IMP+ INSTRUCTION MANUAL 
 
26 
Loss of Echo Set-up 
When a relay is assigned to Loss of Echo (LOE) or fault condition, it will be 
set as an alarm relay which will be de-energised to turn the alarm (LOE) 
“ON” and energise to turn the alarm (LOE) “OFF”. In this way, loss of power 
will ensure that the alarm is activated. 
To set a LOE alarm relay, set the first parameter for the relay to equal 1 
and set the second parameter to 4 
Example:  Setting Relay 1 for LOE Alarm purposes, set P210 to 1 and then 
set P211 to 4.  
When a relay is assigned to LOE no further parameters are required. 
 
Setting Security Passcodes 
A passcode is used to switch the IMP+ from Run Mode into Program 
Mode. 
You can set a new passcode to prevent anyone changing any of your 
settings within your IMP+. The default passcode is 1997, but this may be 
changed as follows. 
Using A Passcode 
If you do not want to use a passcode, you can disable it as follows. First, 
enter Program Mode and go to the SyS1 (System) menu. Select P921 
which is the passcode enable parameter. 
As shown on the display, setting the passcode enable to ‘0’ will disable it, or 
‘1’ will enable the use of passcode. 
Important Notice 
The passcode is also used for remote access using the RS232, so if this is being 
used, be sure to ensure any additional equipment using this feature is changed 
accordingly.