
20
NON-POWERED INTERFACE CONVERTERS
NOTE
On the unit, up (
≠
) indicates ON and down (Ø) indicates
OFF.
2. Set the internal switches according to Table 3-1.
3. Chassis GND: To connect the chassis ground
(pin 1 or RS-232) to signal ground (pin 7 of
RS-232), set chassis GND to CON. To
disconnect, set to DIS (factory setting).
4. Close the unit by pressing the two halves
of the cover together.
5. Power is normally derived from the data and
control signals. To ensure proper operation,
the DTE should provide the following signals,
using standard V.24/RS-232 drivers at
±12 volts:
TD (pin 2), RTS (pin 4), and DTR (pin 20).
If some signals are not available, or if they
do not provide enough power, a powered
converter must be used. (Call your supplier
for more information on products IC108A
and IC109A.)