Unitec Sierra Management System - Manual (Page 39)

Sierra Programming Reference Manual 29
Figure 28. Wash Interface Screen
This screen allows you to setup the wash interface configurations. Click the box next to the feature to select
it. Please consult your wash manufacturer’s instructions for details on interfacing with the wash equipment.
1. Select the Handshaking Type. The entry units support three types of handshaking:

None – This handshake is used in attended tunnel applications. The wash equipment does
not send a wash-in-use signal to the unit. The unit will automatically reset to the wash menu
screen 20 seconds after a transaction is completed.

Wash-In-Use (voltage present) – The car wash activates the wash-in-use signal for the entire
time the car wash is in use. This option needs to be selected if an entry gate is being used in
conjunction with the entry unit.

Cycle Complete – The “Wash-In-Use” is normally on (voltage present). When it is given a
“wash is completed” signal (no voltage present), the car wash will deactivate the “Wash-In-
Use” signal for about two seconds and it will be reactivated. If your car wash supports the
“Wash-In-Use” method, you should not use the “Cycle Complete”.
2. Select Start Button Operation for conveyor wash applications where the customer will need to press
a start button to activate the conveyor. This option is only displayed when handshaking is set to
“None.”
3. Auto OOS Detection – Check this box if the wash controller will toggle the Wash in Use high or low
to signal an out of service condition.
4. Fault OOS Detection – Check this box if a separate fault signal is available from the wash equipment
to indicate an out of service condition, then select the whether the wash signal will go high or low
and enter the delay in seconds.
5. Relay Latching – The relay output can be either Latched or Pulsed. Checking the Relay Latching box
sets the relay output to Latched. This needs to be “off” if an entry gate is being used in conjunction
with the entry unit.