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ROC827 Instruction Manual
Issued Mar-06 General Information 1-10
respective database point. These values are available for display and
historical archiving.
SRBX
Spontaneous-Report-by-Exception (SRBX or RBX) communication
allows the ROC827 to monitor for alarm conditions and, upon
detecting an alarm, automatically reports the alarm to a host computer.
Any kind of communications link—dial-up modem or serial line—can
perform SRBX as long as the host is set up to receive field-initiated
calls.
Protocols
The firmware supports both the ROC Plus protocol and the Modbus
master and slave protocol. ROC Plus protocol can support serial
communications and radio or telephone modem communications to
local or remote devices, such as a host computer. The firmware also
supports the ROC Plus protocol over TCP/IP on the Ethernet port. The
ROC Plus protocol is similar to the ROC 300/400/500 protocol, since
it used many of the same opcodes. For more information, contact your
local sales representative.
The ROC800-Series firmware also supports Modbus protocol as either
master or slave device using Remote Terminal Unit (RTU) or American
Standard Code for Information Interchange (ASCII) modes. This allows
you to easily integrate the ROC827 into other systems. Extensions to the
Modbus protocol allow the retrieval of history, event, and alarm data in
Electronic Flow Metering (EFM) Measurement applications.
Note: In Ethernet mode, the firmware support Modbus only in slave mode.
Security
The ROCLINK 800 software also secures access to the ROC827. You
can define and store a maximum of 16 case-sensitive user identifiers
(User IDs). In order for the ROC827 to communicate, a case sensitive
log-on ID supplied to the ROCLINK 800 software must match one of
the IDs stored in the ROC827.
The operating system firmware supports the application-specific firmware
supplied in the Flash ROM. The application firmware includes
Proportional, Integral, and Derivative (PID) Control; FSTs; Spontaneous-
Report-By-Exception (SRBX) Communications Enhancement; optional
American Gas Association (AGA) Flow calculations with station support;
and optional IEC 61131-3 language programs (using DS800 Development
Suite software). Applications reside, so you do not need to re-build and
download the firmware for changes in calculation method.
Input Module
Addressing
The ROC800-Series firmware, by default, supports 16 addressable
points per module slot. However, to accommodate all the ROC827’s
expanded input capabilities (up to 27 module slots), you must set the
firmware to support eight (8) addressable points per module slot.
(Accomplish this using ROCLINK 800 and selecting ROC >
Information. On the Device Information screen’s General tab, click
the 8-Points Per Module radio button in the Logical Compatibility
Mode frame.)