Controller - Institute of Transportation Engineers

CPU / FCU operation at POWER UP shall be as follows:
5.4.2.11.7
1. FCU Comm Loss Flag set. FAULT and VOLTAGE MONITOR outputs
set to FALSE state.
2. CPU REQUEST MODULE STATUS COMMAND Message with “E” bit
set is sent to FCU to clear Comm Loss Flag and responses to CPU with
“E” bit set.
3. Before the Comm Loss timer expires, the SET OUTPUT COMMAND
data must be sent. In that data, the 078 and 079 logically set to “0” will
cause the FCU microprocessor port pins assigned for FM and VM outputs
to go to their TRUE state. At this point, the signal outputs defined in the
message will be permitted at the output connectors. Any number of other
messages may be sent between the MODULE STATUS COMMAND and
SET OUTPUTS COMMAND.
4. If the above message sequence is not followed, Comm Loss Flag shall be
set (or remain) and VM & FM shall retain the FALSE output state.
5. This is operational and preceded User Software.
A CPU / FCU Communications Loss during normal operation shall cause all outputs to
go blank (FALSE state) and shall set the Comm Loss Flag. FM and VM outputs shall be
in FALSE state.
5.4.3 Type 2070N Back Cover
The 2070N Back Cover shall be provided to protect the interface harnesses. The Back
Cover shall be delivered attached to the 2070 ATMS Controller Unit and 2070-8 NEMA
Interface Module per Section 5.
5.5 Chapter Details
TABLE OF CONTENTS
Type 2070-6 - Async/Modem Serial Comm Module 5-5-1
Type 2070-7 - Serial Comm Module 5-5-2
Type 2070N - NEMA Module, Front View 5-5-3
Type 2070N - NEMA Module, Side View 5-5-4
Type 2070N - NEMA Module, Isometric View 5-5-5
Standard for the ATC – Type 2070 March 29, 2001
92