Specifications

66 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. E

Baud Rate/Format This screen is used to set or display the communication attributes for the DATA

INTERFACE port. For a description of the communication attributes, see BAUD

[xxxxx abc] command

, Page 38.

To change the baud rate, press ENTER, then press the left arrow button to move

the underscore under the baud rate. Then use the up/down arrow buttons to select

a new baud rate.

To change the data format, press ENTER, then press the right arrow button one or

more times to move the underscore (_) under the character to change. Then use

the up/down arrow buttons to change the character. Repeat for the other

characters in the data format if necessary. Press ENTER to make the change.

Emphasis This screen is used to enable or disable pre-emphasis and de-emphasis on the

analog input and output signals.

Pre-emphasis is a function used in older analog radios where the modulating signal

is increased (at the transmitter) at the higher frequencies to increase system

performance. De-emphasis compensates (at the receiver) for a signal that has had

pre-emphasis applied.

To enable or disable pre-emphasis and de-emphasis, press ENTER, then use the

up/down arrow buttons to display ENABLED or DISABLED. Press ENTER to make

the change.

Clear-to-Send

Delay

This screen is used to set or display the Clear-to-Send Delay. This is the amount of

time to wait after RTS is asserted by the host computer on the data port before

asserting the CTS line. When the delay is 0, data will be sent out the data port

without imposing a keying delay.

To change the delay, press ENTER, then use the left/right arrow buttons to select

the digit to change. Then use the up/down arrow buttons to increase or decrease

the digit. Repeat for the other digits if necessary. Press ENTER again to make the

change.

Push-to-Talk Delay This screen is used to set or display the Push-to-Talk Delay. This is the amount of

time to wait after RTS is asserted by the host computer before the radio is keyed

and begins to transmit. When the delay is 0, the radio will key up immediately

following the keying signal.

To change the delay, press ENTER, then use the left/right arrow buttons to select

the digit to change. Then use the up/down arrow buttons to increase or decrease

the digit. Repeat for the other digits if necessary. Press ENTER again to make the

change.

BAUD [xxxxx abc] command,

Page 38

EMP [ON/OFF] command,

Page 42

CTS [0-255] command,

Page 40

PTT [0-255] command,

Page 47