GENERAL NOTES
SUMMARY OF XSF FLAGS
(Communications Operation of XSF flags is required)
XSF2 - Warning Signs and Internally Illuminated Pavement Lights (on-line)
XSF3 - Control of Boom Barrier (on-line)
GENERAL OPERATION
If Local Control (Detector 1) is ON or Emergency Stop/Booms Reset then Auto Control (i.e. remote operation) is disabled.
XSF Flags
When XSF2 is first sent, Pedestrian Wait State 1 is activated to switch the Warning signs. If Detector 3 (Main Warning Light input) is not switched ON within 5 secs (Special Purpose Timesetting no. 9) of XSF2 being sent then set MSS Flag 9 to send a warning message to the TMC. When XSF2 is sent start Timer 2 (Special Purpose Timesetting no. 10, which is initially set to 0 seconds). The Boom cannot be lowered until Timer 2 has expired. If both XSF2 and XSF3 are cleared and Detector 3 is still ON after 5 secs (Timesetting no. 9) then set MSS Flag 10.
When XSF3 is first sent after XSF2 flag set, Pedestrian Wait State 2 is activated to lower the Boom barrier. If Detectors 6 (Boom Horizontal) is not switched ON within 20 secs (Special Purpose Timesetting no. 11) of XSF3 being activated then set MSS Flag 11 to send warning message to the TMC. If XSF3 is cleared and Detectors 4 is not switched ON within 20 secs (Special Purpose Timesetting no. 11) of XSF3 being cleared then set MSS Flag 12.
Communications must be established and XSF3 removed before the Boom can be raised, unless the Local Control is ON. When XSF3 is removed or the Local Control is ON then both Pedestrian Wait States 1 and 2 are switched OFF. The operation can only be re-activated if the XSF flags change state from OFF to ON.
If NO Boom input, Det 4 (Vertical) or Det 6 (Horizontal) is received within 20 secs (Special Purpose Timesetting no. 11) then set MSS Flag 15 to send message to TMC. (Possible Cable Fault)
PEDESTRIAN WAIT STATE OPERATION
Pedestrian Wait State 1 is used to switch the Warning Signs.
Pedestrian Wait State 2 is used to lower/raise Boom barrier.
Pedestrian Wait State 3 is used to indicate Communication status.
DETECTOR OPERATION
Detector 1 - Local Control ON
- Detector 1 activated disables Auto control (remote) of booms and sets MSS Flag1 to send a message to the TMC.
Detector 2 - DC Supply Fail
- Detector 2 activated sets MSS Flag 7 to send a message to the TMC.
Detector 3 - Warning Lights 
Detector 3 activated sets MSS Flag 3 to send a message to the TMC.
Detector 4 - Booms Vertical
Detector 5 - Not Used
Detector 6 - Booms Horizontal 
Detector 7 - Not Used
Detector 8 - Main Supply Fail/UPS Online: Critical Alarm
- Detector 8 activated sets MSS Flag 8 to send a message to the TMC.
Detector 9 - Not Used
Detector 10 - Auto Control (Remote) ENABLED
Detector 10 activated sets MSS Flag 6 to send a message to the TMC.
Detector 11 - Emergency Stop Activated
Detector 11 activated sets MSS Flag 14 to send a message to the TMC.
Detector 12 - Boom Reset Activated
Detector 12 activated sets MSS Flag 14 to send a message to the TMC.