I-2
MDS 4790M (MPT 1411) I/O Guide
MDS 05-3628A01, Rev. B
INIT (reset customer-programmable settings) 35
KEY (activate transmitter). See also DKEY command 35
LOG (display/clear history of system events) 36
MODE (display whether master or remote) 36
MODEL (display radio model number) 36
MODEM (set modem speed) 36
NMASK (classify minor alarm events). See also AMASK
command 36
OPT! (list installed radio options) 37
OWM command (set/display text message) 37
OWN command (set/display text message) 37
owner and radio information, PC 28
PC, summarized 24–28
PROG (upgrade internal software) 37
PTT (set/display push-to-talk delay) 38
RADIO (set/display active transceiver board) 38
radio operation, PC 25
REPEATER (enable/disable repeater configuration) 38
RSSI, RSSI! (display received signal strength
indication) 38
RTU (enable/disable internal RTU) 39
RX (set/display receive frequency) 39
RXLEVEL (set/display audio receive level) 39
RXPAD (enable/disable receive attenuator) 40
RXTOT (set/display receive time-out timer value) 40
SCD (set/display soft carrier de-key delay) 40
SER (display radio serial number) 40
SHOW (display various settings) 40
SNR, SNR! (display signal-to-noise ratio) 41
SREV (display software release information) 41
STAT (display alarm status). See also ALARM
command 41
TEMP (display internal temperature) 42
TIME (set/display time) 43
TOT (set/display time-out timer) 43
TX (set/display transmit frequency) 43
TXGAIN (enable/disable transmit audio boost) 44
TXLEVEL (set/display transmit audio level) 44
UNIT (set/display radio’s address) 44
Connector
analog orderwire (voice communications) 19
analog orderwire, illustrated 17
Continuous Keying screen 56
Controls
front panel 47
front panel, illustrated 21, 47
using to configure radio 48
Cooling fan
location, illustrated 71
cooling fan maintenance 71
CTS command (set/display clear-to-send timer) 32
D
Data
characteristics 72
connector pinouts, table 18
connector, illustrated 17
connector, installing 17
enable/disable buffering (LCD screen) 57, 58
Data Buffering screen 57, 58
Data interface port
set display communication attributes for (BAUD
command) 31
set/display received data handling mode (BUFF
command) 31
DATAKEY command (set/display key-on-data mode) 33
DATE command (set/display date) 33
dBi, defined 6
dBm
conversion to watts or volts, table 80
defined 6
DCE (Data Circuit Terminating Communications Equipment),
defined 7
Decibel (dB), defined 7
Diagnostic port
cable connecting PC to radio 24
connecting 19
J1 pin connections, illustrated 19
Diagnostics 23–62
connecting a PC to the radio for 24
network-wide setup, illustrated 66
using LCD screens 64
Display
active connector port (SHOW command) 40
active transceiver board (RADIO command) 38
active transceiver board (Radio Selection screen) 61
active transceiver board’s serial number (Serial Number
screen) 62
actual RF power output (SHOW command) 40
alarm conditions (Active Radio Status screen) 61
alarm status in hexadecimal format (ALARM
command) 28
audio receive level (Receive Level screen) 58
audio receive level (RXLEVEL command) 39
baud rate/format (Baud Rate/Format screen) 54
clear-to-send delay (Clear-to-Send Delay screen) 55
clear-to-send delay (CTS command) 32
communications attributes for data interface port (BAUD
command) 31
continuous key time-out (TOT command) 43
data handling mode (BUFF command) 31
date (DATE command) 33
date (Set Date screen) 60
DC input/output voltages (SHOW command) 40
event history (Event Log screen) 62
hardware revision level (HREV command) 35
hexadecimal alarm codes (Alarm Masks screen) 59
hexadecimal major alarm codes (AMASK command) 30
hexadecimal minor alarm codes (NMASK command) 36
history of system events (LOG command) 36
intensity of LCD characters (Display Contrast screen) 59
internal modem speed (Modem screen) 54
internal temperature (TEMP command) 42
internal temperature and voltages (LCD screen) 62
keying mode (continuous, DCE) (Continuous Keying
screen) 56
keying mode (key-on-data, key-on-RTS) (Key On Data
screen) 57
key-on-data mode (DATAKEY command) 33
LCD background brightness (Backlight Intensity
screen) 59
list of installed radio options (OPT! command) 37
output power (Output Power screen) 54
owner message (OWM command) 37
owner message (Set Owner Message screen) 60
owner name (OWN command) 37
owner name (Set Owner Name screen) 59
Pin 25 alarm output (ASENSE command) 31
push-to-talk delay (PTT command) 38
push-to-talk delay (Push-to-Talk Delay screen) 55
radio address (Unit Address screen) 57
