CKEY [ON
–
OFF]
Key TX
Continuously
The
CKEY
command enables or disables the continuously-keyed func-
tion of the radio. When
CKEY
is set to
ON
, the radio is continuously keyed
and the Timeout Timer is disabled.
CTS [0
–
255]
Clear-to-Send Time
The
CTS
(clear-to-send) command selects or displays the timer value
associated with the CTS line response. The command parameter ranges
from 0 to 255 ms.
For DCE operation, the timer specifies how long to wait after the RTS
line goes high, before the radio asserts CTS and the DTE transmits the
data. A CTS value of zero keys the radio and asserts the CTS line imme-
diately after the RTS line goes high.
For CTS Key operation (see
DEVICE
command), the timer specifies how
long to wait after asserting the CTS, before sending data out through the
DATA INTERFACE
port. A timer value of zero means that data is sent
through the data port without imposing a key-up delay. Other delays
might be present based on selected radio operating commands.
DATAKEY [ON, OFF]
Key on Data Activity
The
DATAKEY
command enables or disables the ability of the radio to key
the transmitter as data is received at the
DATA INTERFACE
connector.
Asserting RTS keys the radio regardless of this command setting.
If
DATAKEY
is set to
ON
, the radio will key when a full data-character is
received at the transceiver
’
s
DATA INTERFACE
connector. If
DATAKEY
is
set to
OFF
, the radio needs to be keyed by asserting either the RTS or
PTT signal, or with the
CKEY
or
KEY
command.
DEVICE [DCE, CTS KEY]
Data Device Mode
The
DEVICE
command controls or displays the device behavior of the
radio. The command parameter is either
DCE
or
CTS KEY
.
In
DCE
mode (the default setting), CTS will go high following RTS, sub-
ject to the CTS programmable delay time. If the
DATAKEY
command is
set to
ON
, keying can be stimulated by the input of characters at the data
port. Hardware flow control is implemented by signaling the CTS line if
data arrives faster than it can be buffered and transmitted.
In
CTS KEY
mode, the transceiver is assumed to be controlling another
radio. It will still key based on the RTS line, but the CTS line is used as
a keyline control for the
other
radio. CTS is asserted immediately fol-
lowing the receipt of RF data, but data will not be sent out the
DATA
INTERFACE
port until after the CTS programmable delay time has
expired. This gives the other radio time to key.
05-3305A01, Rev. E 25
Summary of Contents for 1710 Series
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