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SLTA Option Card
3.
3.1.
3.2.
6
Serial LonTalk™ Adapter
Technical Reference Manual
Functions
General
The SLTA option card contains one fibre-optic transmitter/receiver pair and one
RS232 interface. Both of these communication interfaces are connected to the SLTA
core module, LTS-20. In addition to this, the fibre-optic pair is connected to the open
collector bus on the mother board of the RER 111 unit. A message received from the
RS232 interface is sent to the fibre-optic channel on the option card and the open
collector bus on the mother board. A message received from the mother board is sent
to both the fibre-optic transmitter and the RS232 interface.
The SLTA option card also contains a service switch. Pressing this switch generates
a service pin message. This service pin message is used by the network management
device (e.g. higher-level processors, PC. etc.) to install and configure the SLTA
option card. The service pin message is only sent to the L
NOT sent to the RS232 interface.
The SLTA option card also contains a service LED. This LED is blinking when the
SLTA is in the unconfigured state. After configuration of the SLTA option card, the
LED is off.
The configuration and the use of the SLTA option card requires a host device, for
example, a PC or a SRIO 1000M. From the host device it is possible to send network
management commands via the SLTA option card to the L
When a PC is used as the host device a network management program and a driver
have to be installed in the PC. The driver makes enables the network management
program to send data to the SLTA option card via the RS232 connection with the
correct protocol (Alert/Ack or buffered link protocol).
The SLTA option card has a self-supervision feature for continuous light reception.
If the fibre-optic channel receives continuous light, the reception on the channel is
cut off. The error is notified to the I/O module of the RER 111 LON Star Coupler
via the error line. Error reset is also notified. For information regarding the error line
of the RER 111 Star Coupler, refer to the RER 111 manual 1MRS750104-MUM,
chapter 4.1.
The indication LED of the fibre-optic channel is continuously lit if continuous light
is received.
RS232 interface
The RS232 interface is a 9-pin D-type female connector.
The RS232 interface can be configured to operate as Data Communication
Equipment (DCE) or Data Terminal Equipment (DTE). This DTE function allows a
pair of modems to be used and a telephone line to be connected, enabling the
L
W
network to be controlled from a remote source.
ON
ORKS
Other user definable parameters are:
- automatic communication speed detection
- user definable communication speeds are 1200, 2400, 9600, 14400, 19200,
38400, 57600 and 115200 bits per second.
1MRS 750107-MUM
W
network. It is
ON
ORKS
W
network.
ON
ORKS
ABB Automation
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