Littelfuse SE-485-DIN Series - Manual (Page 5)

Startco Engineering Ltd. Page 1
SE-485-DIN Converter Rev. P1
Pub SE-485-DIN-M, November 9, 2004
1. I NTRODUCTION
1.1 G ENERAL
Startco Engineering Ltd. purchases the 485LDRC9
from B&B Electronics Ltd and modifies this component
to create the SE-485-DIN. Sections of this manual were
taken from the B&B Electronics publication “485LDRC9-
1903-1/3”, tables were revised to reflect our unique
application.
The SE-485-DIN optically isolates and converts
unbalanced, full or half-duplex RS-232 signals to
optically isolated, balanced, full or half-duplex RS-422 or
RS-485 signals at baud rates up to 115.2 kbps. This unit
also surge suppresses the RS-422/485 lines. It features
Send Data Control circuitry so no software control of
handshake lines is required in RS-485 mode.
Baud rate is switch selectable from 9600 baud to 57600
baud. In two-wire RS-485 mode, the SE-485-DIN is
compatible with all Startco products with the RS-, EIA-,
or TIA-485 interface.
1.2 D ESCRIPTION
Three LED’s indicate RS-485 Transmit Data, RS-485
Receive Data, and Power.
The SE-485-DIN has terminal blocks on the RS-232
side and the RS-422-485 side. The RS-232 side also has a
DB9 female connector. Transmit (TD), Receive (RD) and
Ground are supported on the RS-232 side. The unit is
powered by a supply voltage of 10 to 30 Vdc on the
RS-232 side. Transmit Data A (-), Transmit Data B (+),
Receive Data A (-), Receive Data B (+), and Ground are
supported on the RS-422/RS-485 side. Communication
features on the SE-485-DIN are dipswitch selectable on
the unit.
FIGURE 1 Outline and Configuration Details