User's Manual

Page 136 FRH-SD07TU/TB Manual
Transition to/from ULTRA mode
The DTR pin of the communication connector is used to transit to the ULTRA mode and
return to the Active mode. The logic level of the input pin of the FRH-SD07TU/TB is
escribed below. If the RS232 transceiver IC chip is connected, be noted that its logic level
Figure 7–7: Transition to ULTRA mode
o transit to the ULTRA mode, set the DTR pin to Hi level. The modem detects the rising
dge of DTR pin and transits to the ULTRA mode. For returning to the Active mode, set
e DTR pin to the Lo level.
Since the DSR p the completion
of both transition
e following sections.
d
inverts from the following description.
Request the ULTRA mode
N
ow in the ULTRA mode
DTR(input)
DSR(output)
T
e
th
in is used to monitor the ULTRA mode state, it can confirm
to the ULTRA mode and returning to the Active mode.
It is possible to make the modem in the ULTRA mode return to the Active mode through
the radio link. Details are described in th
Rev. 050415-01.1