Delta RMC101 User Manual

Browse online or download User Manual for Sensors Delta RMC101. Delta RMC101 User Manual

  • Download
  • Add to my manuals
  • Print
  • Page
    / 9
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 0
DMCP User Guide Page 1 of 9 October 23, 2001
Delta Motion Control Protocol (DMCP)
User Guide
Why Another Protocol?
The RMC supports many application protocols; most were designed by other automation
companies. However, when Delta Computer Systems, Inc. needed to choose a protocol
to use for its own software, such as the RMCENET ActiveX Control, to communicate
with the RMC, it found that none of these protocols satisfied this simple list of
requirements:
1. It must have binary, little-Endian, word-aligned encoding.
2. It must have low data and processing overhead.
3. It must be flexible enough to allow addressing of a minimum of 65,536 16-bit
registers.
4. It must be non-connection based to support both UDP and TCP operating modes.
Therefore, Delta designed yet another application protocol, called Delta Motion Control
Protocol (DMCP).
DMCP versus Modbus/TCP
Users who want to control or monitor the RMC through TCP or UDP must select one of
the protocols the RMC supports. Delta recommends two of these protocols: DMCP and
Modbus/TCP. All other protocols supported by the RMC are either difficult to get
information on, complicated, or inefficient. We will now compare DMCP and
Modbus/TCP.
DMCP was designed by Delta Computer Systems for its own products and is not
implemented by other manufacturers. Modbus/TCP is an open protocol maintained by
Schneider Electric and implemented by many manufacturers; this is the main advantage
of Modbus/TCP.
The following chart compares the technical specifications of these two protocols:
Characteristics DMCP Modbus/TCP
Transport Protocols
TCP, UDP TCP
Byte Order
Big or Little Endian Big Endian (Motorola)
Data Alignment
16-bit 8-bit
Static Header Size
7 bytes 8 bytes
Maximum 16-bit
Registers per Packet
TCP: 2048
UDP: 512
Read: 125
Write: 100
Page view 0
1 2 3 4 5 6 7 8 9

Summary of Contents

Page 1 - User Guide

DMCP User Guide Page 1 of 9 October 23, 2001 Delta Motion Control Protocol (DMCP) User Guide Why Another Protocol? The RMC supports many application

Page 2 - DMCP Characteristics

DMCP User Guide Page 2 of 9 October 23, 2001 Because of the above statistics, DMCP can be significantly faster than Modbus/TCP, as demonstrated by t

Page 3 - DMCP Format

DMCP User Guide Page 3 of 9 October 23, 2001 DMCP Format DMCP is a simple request/response protocol. Once the client has an open TCP or UDP connect

Page 4 - Function Code List

DMCP User Guide Page 4 of 9 October 23, 2001 UDP Considerations DMCP is designed to work over either TCP or UDP. However, because UDP does not supp

Page 5 - Example

DMCP User Guide Page 5 of 9 October 23, 2001 10 Read Device Registers (little Endian) Description This block reads from the device’s registers. The

Page 6

DMCP User Guide Page 6 of 9 October 23, 2001 11 Write Device Registers (little Endian) Description This block writes to the device’s registers. The

Page 7

DMCP User Guide Page 7 of 9 October 23, 2001 12 Read Device Registers (big Endian) Description This block is identical to block 0x10, except that th

Page 8

DMCP User Guide Page 8 of 9 October 23, 2001 13 Write Device Registers (big Endian) Description This block is identical to block 0x11, except that t

Page 9

DMCP User Guide Page 9 of 9 October 23, 2001 Revision Log The following changes have been made to this protocol: Date Author Changes July 1, 1999 Q

Related models: RMC100

Comments to this Manuals

No comments