Manual

Communications Package for W INTERPRET (T3831)
PD - 6041 March, 06 19
4) Each variable provided by a particular project is defined
for that project (in its I/O or shared variable definitions).
The compiler uses the list of GPL out put variables to look for
identically named variables in each of the other participating
projects. When an identical name is found, the compiler
checks that the variable is a similar data type (e.g. bit, word,
or floating point) and can be written (e.g. most system
variables like VRESET are write protected). The compiler
does not check the variables for comm protection.
When the compiler completes successfully, the Input and
Output Templates for each project are created and stored in a
subdirectory called 2NETWORK in each participating
project’s directory. This information will be used when the
GPL network is loaded for each project (see Load Network,
page 21 ).
Installation Planning
Each leg of the Guarded Peer - Link communications network
uses a bussed 2 - wire RS485 compatible link. The T3150A
communications module supports the direct connection of
RS485 serial links. This module is shipped from the factory
configured for RS232 and RS422 operating modes. The
module must be disassembled and configuration jumpers re -
positioned to support RS485. The ICS Regent Product
Description, PD - 6002, describes the necessary procedure to
correctly configure the module for RS485 communications.
Alternately, RS232 ports of a Regent can be used if an
external RS485 - to - RS232 converter is installed. If your
Regent system has T3150 or T3151 communications modules
(which only support RS232) you will need to use external
serial converters.
GPL Network Cabling
Figure 11 il lustrates the required 2 - wire bussed serial
connections used for GPL communications. At each Regent
the transmit data signal pair (TX+, TX - ) is jumpered to the
receive data signal pair (RX+, RX - ). Contention control is