Application and Installation Guide EMCP 4 SCADA Data Links
©2013 Caterpillar
All rights reserved. Page 3
1.4 GLOSSARY OF TERMS
0b
(e.g., 0b1001)
The prefix “0b” Indicates that the following digits represent a binary number. e.g.,
0b1001 indicates 1001 binary, which is 2
3
+2
0
= 9 in decimal.
0x
(e.g., 0xFE03)
The prefix “0x” indicates that the following digits and characters represent a
hexadecimal number. e.g., 0xFE03 indicates FE03 hex, which is 15×2
12
+14×2
8
+3 =
61440+3584+3 = 65027 in decimal.
CAN Controller Area Network. A serial communications data link with widespread use in the
transportation and power generation industry. The strengths of this data link are
reliable communications and plug-and-play operation. The EMCP 4 Primary Data Link
and Accessory Data Link (EMCP 4.2, 4.3, and 4.4) are CAN data links. They are
intended for generator set package communications only.
CRC Cyclic Redundancy Check. This is an algorithm used to catch (and sometimes correct)
transmission errors. The CRC is generated and transmitted at the source, then re-
generated and compared at the target. The EMCP 4 GSC performs a 16-bit CRC
check, which is often called a CRC16 algorithm.
EMCP 4 This is the new generation Cat generator set control panel, consisting of a generator
set control (GSC), and may have several other modules such as a voltage regulator
module, annunciators, and input/output modules.
ECM Electronic Control Module. This is a general term and can refer to any microprocessor-
based module that is part of a control system. The engine ECM is an ECM dedicated to
the task of engine timing and air/fuel control.
Cat ET Caterpillar Electronic Technician. This is a software tool used for configuration and
troubleshooting. It communicates with ECMs via the Primary or Accessory Data Links.
FMI Failure Mode Indicator. The J1939 term for a failure code associated with a particular
Suspect Parameter Number. For a complete list of FMI codes, refer to the Systems
Operation Troubleshooting Testing and Adjusting guide.
GSC Generator Set Controller. This is the module responsible for the overall generator
protection and control functions. It is the master module on the generator set,
interfacing with the user as well as the engine ECM and any other accessory modules.
This unit is physically identifiable by its display screen, and a label identifying it as an
EMCP 4.1, 4.2, 4.3, or 4.4 Generator Set Controller. See cover page for an image of
the EMCP 4.4 GSC.
LED Light-Emitting Diode. LEDs on the EMCP 4 include the warning, shutdown, and ECS
mode indicators on the EMCP 4 GSC, as well as the status indicator on the DIO
module, and all the alarm and network status indicators on the RS-485 Annunciator
module.
Modbus An openly published serial communications protocol developed by Modicon with
widespread use in industry. This protocol is commonly used over RS-232, RS-485, and
Ethernet TCP/IP networks. The RS-232 and RS-485 version is a master/slave protocol,
whereas the TCP/IP version is a peer-to-peer protocol. The strengths of this protocol
are its simplicity and low implementation cost.
NULL
CHARACTER
The name for the ASCII character represented by 0x00 (1 byte of binary zeroes). This
character is commonly used to mark the termination of an ASCII string.
RMS A mathematical approach of representing a useful average for varying quantities; this is
useful to indicate AC quantities.
RS-232 Officially EIA-232. A serial communications network intended for short-distance point-
to-point (only between two devices) communication. Maintained by the Electronics
Industries Alliance (EIA).
RS-485 Officially EIA-485. A serial communications network intended for long-distance multi-
point communication. Maintained by the Electronics Industries Alliance (EIA).
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