Alstom GEM80-400 Series, Техническое руководство

Страница: 171 / 325

GEM80-400 4. Communications
Issue 3 04/99 ALSPA GEM 80-400 SERIES CONTROLLERS TECHNICAL MANUAL Page 4-1
4.
Communications
4.1.
Introduction
GEM 80-400 Controllers may transfer and receive controller memory data using
serial communications links. The serial ports can be used for the following types
of application:
(1) Operating the GEM 80-400 Controller as part of a distributed controller
network, i.e. data table exchange with other GEM 80 controllers or other
intelligent devices, or supervisory operations or co-ordinated operation of
GEM 80 controllers. Details are given in the 'Data Tables' section
.
(2) Supplying controller data, i.e. alphanumeric characters for intelligent
devices, printers, VDUs or keyboards, to a computer for statistical analysis
and data logging. See the 'Communication with a Printer, VDU or Suitable
GEM
80 Programming Tool' section for details.
(3) Connecting the controller to a suitable GEM 80 programming tool, such as
Gemesys 3, or a printer.
(4) Communication with, and connection to intelligent serial devices and
Central Highway Modules, such as GEMLAN-D and STARNET.
The GEM 80-400 Controller has three serial communications ports, namely Port 1,
Port 2 and Port 3. A 9-way 'D'-type connector is used to connect Ports 1 and 2,
and a 15-way 'D'-type connector is used to connect Port 3; these are situated on
the front panel of the processor module. Port 3 is an RS232/20mA port and is
used to connect either a printer or a suitable GEM
80 programming tool, such as
Gemesys 3, to the controller; it also provides a monitoring facility. Ports 1 and 2
are general purpose RS485/RS232 serial ports which support four different GEM
80
serial communications protocols, these are:
(1) Extended Simple Protocol (ESP);
(2) ESP with flexible data tables;
(3) GEMSTART CCU;
(4) ASCII (Printer/VDU Terminal).
The signalling rate is user adjustable between 110 and 19,200 bits per second.
These rates are selected by preset data, P-tables, for each port. Figure 4.1
shows the serial port connections.