User's Manual
COMPANY CONFIDENTIAL
RF-TWACS Based AMR System DCSI CUSTOMER PRODUCT SPECIFICATION
May 30, 2003 Application Notes – Rev. 1 22
4.3.3.4 Timing
The “Present” total consumption reading (updated hourly) is available at any time. The
Daily Frozen total consumption reading is available for 23 hours during the day. The
CCE must give the RCE time to move the frozen read up to the EMA. For this reason,
harvest of the frozen reading must not begin until one hour after the service freeze time.
Harvesting can continue for the next 23 hours -- until the service freeze time rolls around
the next day.
4.4 RCE Registers and Tables and the CCE Response
4.4.1 Programmed Into Meter
4.4.1.1 Inbound Response Header
Important status flags are contained in the EMA response header byte which serves as a
preamble in every TWACS inbound response from an RCE. The header includes Alarm,
Tamper, and Diagnostic Indicators.
4.4.1.1.1 Alarm Indicators
Among the supported alarms are:
• The RMTR associated with this action indicates a near-term battery failure.
• The RMTR associated with this action indicates imminent battery failure.
• The port associated with this action is obsolete. (Obsolete is defined to mean
“Unassigned”.)
• Forced-assignment acquisition list maintenance has occurred. (This bit is cleared
by writing ‘0’).
4.4.1.1.2 Tamper Indicators
Among the supported alarms are:
• The associated RMTR was unplugged from its meter or IED and has now been
reconnected.
4.4.1.1.3 Diagnostic Indicators
Among the supported alarms are:
• EMA Hardware failure.
• EMA to EMTR Communications failure.
• EMTR Hardware failure.
• EMTR to RMTR Communications failure.
• The RMTR associated with this action has reported a hardware failure.
• RMTR to IED communications failure.
• The IED (meter, dial-encoder, or in some cases, pulser) associated with this action
has reported a diagnostic error or has behaved illegally.
4.4.1.2 EMA Registers
The data is exchanged between the CCE and EMA by means of “RCE Read Register”
and “RCE Write Register” commands. The “MultiPort” series of RF capable