GWY-800-B Features
16
Doc No: UMAN\GWY-800-B\0706
REVISION 0
Block #1
Block #2
Block #3
Block #4
Block #n
.
.
.
.
.
When Control word is enabled, it decides which block has to be executed by writing a specific data in the control
word.
4.1
Gateway Modes
Gateway has two modes of operation: Master-Master and Master-Slave. Before explaining these modes further
Master and Slave concept should be explained.
Master:
Master is a Device / device driver which initiates communication.
Slave:
Slave is Device / Device driver which processes Master’s query, takes necessary action and responds to the query, if
necessary.
4.1.1
Master-Master Configuration
In this mode both Gateway ports are master in nature and devices connected on these ports are slave. Gateway
ports initiate communication when the proper Gateway-Device communication cable is attached. Data is transferred
in blocks. This transfer can either be a continuous process or as per requirement. A control word (Section 4.3),
present in device on either side, enabled from Gateway Setup Software, can control the block execution.
When control word is disabled, then block transfer is a continuous process. A block of data is fetched from one
device and transferred to the other device. The amount of data to be transferred (Number of words) depends on Block
definition in “Block Definition Area” in Configuration Software. One block is executed at a time. A cycle consists of
execution of blocks from #1 to #n.
Execution of blocks is performed as follows,