COMMANDS

Command

Source

Function

Programs 1-12

KB, D,RC

(16 opt.)

Reads the contents of the memory location : 2MSB’s to the MS counter, next 2 MSB’s

to the band counter next 12 MSB’s to the tuning counter and D/A and LSB to skip flag

register. Initiates an on command only after standby.

Programs 0-9

KB, D, RC

(20 opt.)

Reads the contents of the memory location : 2MSB’s to the MS counter, next 2 MSB’s

to the band counter next 12 MSB’s to the tuning counter and D/A and LSB to skip flag

register. Initiates an on command only after stndby.

Programs 13-16

D, RC

(16 opt.)

Reads the contents of the memory location : 2 MSB’s to the MS counter, next 2 MSB’s

to the band counter next 12 MSB’s to the tuning counter and D/A and LSB to skip flag

register. Initiates a on command only after standby.

– 10 (decade)

KB, D, RC

(20 opt.)

Sustracts 10 from the current program (if possible). Initiates an on command only after

standby.

+ 10 (decade)

KB, D, RC,

(20 opt.)

Adds 10 to the current program (if possible). Initiates an on command only after standby.

1*

KB, D, RC

(20 opt.)

Commands the M494 to wait for a 0-9 program command or to reset on any other

command. Display shows half digit and g segment flashing at 5Hz. Initiates an on

command only after standby.

Vol. up/down

Bri. up/down

Sat. up/down

Con. up/down

KB, D, RC

Increments up or down the relevant analog control counter every keystrobe or

continuously every 112ms from KB and every 102ms from the RC and data inputs. The

display shows an up/down arrow for 300ms min.

Tune up/down

KB

Increments up or down the tuning counter. The speed or increment/decrement is

defined by Figure 10. The display shows an up/down arrow for 300ms min.

Mem. up/down

KB, D, RC

The program number (memory location) is incremented/decremented.

Mute (toggle)

KB, D, RC

Volume Mute. See mute section.

Standby

D, RC

Commands the standby state.

On/standby

(toggle)

KB, D, RC

Commands the standby state from the on state and the on state from the standby state.

ON/OFF

KB

Commands the on state when in the off state and commands the off state when in the

on state. See standby section.

Store Program

KB

The currently addressed memory location is written from the tuning, band and MS

counters and the skip flag is reset. See fig. 11. Execution of this command is indicated

by the display flashing at 5Hz for 1 second.

Store analog

Controls

KB

The analog control memories are written in sequence from the analog control counters.

Execution of this command is indicated by the display flashing at 5Hz for 1 second.

Band Sequence

KB

Command the next band in the sequence as defined in bands outputs section. One

step for each key strobe.

MS Sequence

KB

Increments the MS counter by binary one. One step for each key strobe.

Normalise

Analog

KB, D, RC

Reads the analog memories in sequence to their corresponding D/A’s. The analog

control outputs are disabled during the read sequence.

Memory

Addressing

KB

Strobes the program selected immediately after the memory addressing command

(post tuning program selection). See Figure 12.

Set Skip Flag

KB

Sets the skip flag on the currently selected program. Execution of this command is

indicated by the display flashing at 5Hz for 1 second.

Skip Defeat

OS

Defeats the function of the skip bit to allow reading and writing of the currently selected

program.

KB = Keyboard; D = Data; RC = Remove Control; OS = Option Select.

Figures 11 & 12 respectively show in flow diagram

from the two methods for storing a station : pretun-

ing program selection and post tuning program

selection.

Figures 13, 14 & 15 show the select program

subroutine for Figures 11 & 12 for either 16 pro-

gram option or 20 program option with 1* or

± 10

(decade modes).

M494

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