Controls and Indicators
Following are the controls and indicators found on
the coupler.
Front Panel
1. Full/Half: this switch sets the duplex (com m unication)
mode of the Expander 2 unit. For half duplex operation
(local copy back), push the switch in. Full duplex
(no copy back) is when the switch is out.
Note: before operating in half duplex mode, make sure
that the system or the term inal does not provide a
local copy back. If so, leave sw itch in fu ll duplex.
2. PWR: this indicator shows that AC power is applied to
Expander 2.
3. CTS: this indicator shows that a valid carrier signal is
being received from the opposite receiving modem.
Rear Panel
1. On/Off: this switch applies AC power to Expander 2.
2. 115 VAC 60 Hz Only: this grounded 3-wire cord plugs
into any 3-wire 115 VAC 60 Hz receptacle.
3. EIA RS232-C: the 25-pin connector is the standard EIA
RS232-C interface. Plug cable from the Expander 1
right into this connector.
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