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Key TX
Continuously
Clear-to-Send Time
Key on Data Activity
Data Device Mode
MDS 05-3305A01, Rev. E
CKEY [ON–OFF]
The
command enables or disables the continuously-keyed func-
CKEY
tion of the radio. When
and the Timeout Timer is disabled.
CTS [0–255]
The
(clear-to-send) command selects or displays the timer value
CTS
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
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]
The
command enables or disables the ability of the radio to key
DATAKEY
the transmitter as data is received at the
Asserting RTS keys the radio regardless of this command setting.
If
is set to
DATAKEY
ON
received at the transceiver's
set to
, the radio needs to be keyed by asserting either the RTS or
OFF
PTT signal, or with the
DEVICE [DCE, CTS KEY]
The
command controls or displays the device behavior of the
DEVICE
radio. The command parameter is either
In
mode (the default setting), CTS will go high following RTS, sub-
DCE
ject to the CTS programmable delay time. If the
set to
, keying can be stimulated by the input of characters at the data
ON
port. Hardware flow control is implemented by signaling the CTS line if
data arrives faster than it can be buffered and transmitted.
In
mode, the transceiver is assumed to be controlling another
CTS KEY
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
INTERFACE
port until after the CTS programmable delay time has
expired. This gives the other radio time to key.
MDS 4710/9710 Technical Manual
is set to
, the radio is continuously keyed
CKEY
ON
command), the timer specifies how
DEVICE
DATA INTERFACE
, the radio will key when a full data-character is
DATA INTERFACE
or
command.
CKEY
KEY
DCE
connector.
connector. If
DATAKEY
or
.
CTS KEY
command is
DATAKEY
DATA
is
25
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