MDS MDS 9710 Series Specifiche Scaricare il pdf (Pagina 30)

22 MDS 4710/9710 I/O Guide MDS 05-3305A01, Rev. D

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 milliseconds.

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 out

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.

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.

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.

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.)

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MDS MDS 9710 Series Specifiche Pagina 30

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