Configurations, Operation, And Installation; Point-To-Point Configuration - GarettCom 5843HRT User Manual

Models 5843, 5844, 5843S and 5844S
RS232 or TTL
2.

CONFIGURATIONS, OPERATION, AND INSTALLATION

Model 5843HRT and Model 5844HRT Link/Repeaters can be connected in a Point-to-Point configuration, in a
Master/Slave Loop, in a Peer-to-Peer Loop or an optical bus depending on the needs of the overall
communication system.
These models are designed to accept electrical inputs per RS-232 and TTL standards.
RS-232 data communication signals are always on pins 2 or 3 (transmit or receive pin assignment is based
upon the setting of the DTE/DCE switch) of the Link/Repeater's 9 Pin D-connector.
For TTL data communication, the transmit (Link/Repeater receive) is on either pin 2 or 3 depending on the
setting of the DTE/DCE switch and the receive (Link/Repeater transmit) is on pin 8.
When the Link/Repeater has a high TTL potential (above 2.4 volts) on its transmit pin, it will transmit optically.
All signal voltage levels on the 9 Pin D-connector are referenced to pin 5 of the D-connector.
Pin 8 always has the TTL data output signal present even during RS-232 communication. Be sure that the
presence of the TTL signal on pin 8 will not adversely affect the IED operation.
It is also possible to optically connect Link/Repeaters together which are connected to IED's with different
electrical formats.
422/485) to DYMEC Models 5843HRT and 5844HRT which are connected to IED's operating RS-232 or TTL
formats.
DYMEC Models 5843HRT, 5844HRT, 5845HRT and 5846HRT can optically communicate to each other,
eliminating the need for format translation interfaces, provided all connected devices are operating at the
same data rate.
2.1

POINT-TO-POINT CONFIGURATION

For Point-to-Point operation, two Link/Repeaters are optically connected to each other.
This configuration permits full duplex communication (simultaneous transmitting and receiving), half duplex
communication (sequential transmitting and receiving), and simplex (transmitting or receiving only).
It is possible to optically interconnect Models 5845HRT and 5846HRT (operating EIA
APPLICATION NOTE
NOTE
2-1