ProSoft Technology MVI46-DFCM - Manual (Page 55)

Reference MVI46-DFCM ♦ SLC Platform
DF1 Communication Module
ProSoft Technology, Inc. Page 55 of 103
October 20, 2008
DF1 Slave Protocol Specifications
The module accepts DF1 commands from an attached DF1 master unit. When in
slave mode, the module can accept DF1 commands from a master to read/write
data stored in the module's internal registers. This data can be derived from other
DF1 slave devices on the network through a master port or from the processor
and is easily transferred to the processor's data registers.
Tested Hardware Connections
Several hardware connections have been tested by ProSoft Technology or have
been customer field tested. The following physical connections have been tested
successfully:
ƒ
RA Panel view (Full Duplex point-point, DFCM as slave)
ƒ RA Processors (Full/Half duplex, DFCM as either master or slave)
ƒ RA Power Monitors (485 Half-Duplex DFCM as Master)
5.2 Functional Overview
This section provides an overview of how the MVI46-DFCM module transfers
data using the DFCM protocol. You should understand the important concepts in
this chapter before you begin installing and configuring the module.
5.2.1 General Concepts
The following discussion explains several concepts that are important for
understanding the operation of the MVI46-DFCM module.
Module Power Up
On power-up, the module begins performing the following logical functions:
1 Initialize hardware components
o
Initialize SLC backplane driver
o
Test and Clear all RAM
o
Initialize the serial communication ports
2 Wait for Module Configuration from SLC processor
3 Initialize Module Register space
4 Enable Slave Driver on selected ports
5
Enable Master Driver on selected ports
After the module has received the Module Configuration Block from the
processor, the module will begin communicating with other nodes on the
network, depending on the configuration.