User Manual
2014 Cervis, Inc.
7
6.0 Operational
Modes
The module can be configured to operate in one of two modes; Push-To-Transmit mode and
Periodic mode. These modes are discussed in this section. Refer to section “8.1 Get / Set
Parameter” for instructions on changing the operational mode.
6.1 Push-To-Transmit Mode
Push-To-Transmit is the module’s default mode. Any time power is applied to the module it will
begin operation in this mode. This mode is a license-free mode of operation (the operator does
not require a license in order to use the module in this mode, following the requirements set forth
by the FCC in CFR 47 Part 15.231). The module limits the maximum output power to 68.1
dBuV.
In order to comply with license free operation the interaction between the host and module has
restrictions. The host may only issue transmit requests when a manual event occurs on the
host, for example when a button is pressed. There is no limit to the number of transmit requests
that can be issued while the event is active. However, once the event has passed, for example
when the button is released, the host must cease issuing transmit requests within 5 seconds.
Periodic transmit requests are strictly forbidden. This includes, but is not limited to, link
maintenance messages, keep-alive messages, and status messages.
6.2 Periodic Transmit Mode
Periodic Transmit mode is intended for licensed operation (CFR 47 Part 90). The module limits
the maximum output power to +15 dBm. In this mode there are no restrictions between the host
and module, provided the user has configured the module to operate on the frequency channel
for which he holds a license.
It is a violation of CFR 47 to operate this module in Periodic Transmit mode without a license.
