72 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
RX Mute Mode Use this screen to set or show the radio’s RX (receive) Muting status. RX muting
might be required when the radio is configured as a full-duplex polling remote
communicating through a repeater. RX muting prevents the radio from hearing its
own transmissions (“echoes”), which causes errors in some software applications.
The default RX Mute time is 5 milliseconds. You cannot change this value from the
front panel, but you can change it using RXMUTE nn command from a PC
interface (see icon below).
To change the RX Mute status, press ENTER, then use the up/down arrow buttons
to select ENABLE (RX Mute on) or DISABLE (RX Mute off). Press ENTER again
to make the change.
Continuous
Keying
Use this screen to set or show the radio’s keying mode (continuous or
non-continuous keying). Typically, set a master station for continuous keying. If
continuous keying is disabled, key the radio with Pin 4 (RTS) of the interface
connector.
To change the keying mode, press ENTER, then use the up/down arrow buttons to
select ENABLE (continuous keying) or DISABLE (non-continuous keying). Press
ENTER again to make the change.
Manual Key Use this screen to manually key or dekey the transmitter. Show the transmitter
state by selecting Transmitter Status from the Diagnostics menu (Page 78).
To key the transmitter, press ENTER, then use the up/down arrow buttons to select
ENABLE (manual keying). Press ENTER again to key the transmitter.
To dekey the transmitter, press ENTER, then use the up/down arrow buttons to
select DISABLE (manual de-keying). Press ENTER again to dekey the transmitter.
Multi-Drop
Address (MADDR)
The radio’s Multi-Drop Address uniquely identifies this radio on an RS-232 COS
(code-operated switch) bus connected to the rear panel’s DIAGNOSTIC PORT, J1.
The unit’s address initially is set as NONE, for a computer directly connected to the
DIAGNOSTIC PORT of one radio. MADDR addresses can range from 1 to 255.
The master station ignores diagnostic messages sent to other Multi-Drop
Addresses.
With the MADDR address programmed, MDS’ InSite™ network management
system program can poll master stations through the COS bus to receive
diagnostic information from the master unit itself. The MADDR command works on
MDS x790 master stations with software version 1.7 or later installed. For more
details, see “Connecting Multiple Masters at One Site” on Page 32.
NOTE: The Multi-Drop Address is not the same as the radio’s Unit Address
described below.
RX Mute Mode
disabled
RXMUTE [ON/OFF/Time
in msec] command,
Page 53
Continuous Keying
enabled
CKEY [ON/OFF] command,
Page 43
Manual Key
disabled
KEY command, Page 47
DKEY command, Page 45
MADDR
134
MADDR [NONE, 1–255]
command, Page 48
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