Miteq 9400 Series User manual

Technical Notes
25T024 Local/Remote Control,
9400 Series Modulation Upconverter
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MITEQ TECHNICAL NOTE 25T024 MARCH 1996
REV C
LOCAL/REMOTE CONTROL
9400 SERIES MODULATION UPCONVERTER
______________________________________
1.1 LOCAL/REMOTE SELECTION
Local/Remote selection operates in one of two ways, depending on the type of Remote
Interface installed. The front panel “REMOTE” key selects either Local (LED Off) or Remote
mode (LED On). The mode alternates with each key press.
The “REMOTE” front panel key operates differently when the converter is configured for IEEE-
488 remote bus operation. The LED above the key still indicates Remote or Local mode (LED
On = REMOTE, Off = LOCAL), however, the function of the key is changed to “GO TO
LOCAL”. The converter cannot be set to Remote mode from the front panel “REMOTE” key.
The converter will automatically go to Remote mode when it is addressed by the IEEE-488
system controller. Pressing the key will return the converter to Local mode.
Remote mode locks out the front panel and allows control of the converter only from the
remote bus. Converter status can still be monitored locally. Any attempt to alter converter
settings, while in Remote mode, causes the error tone to sound and will be ignored. In Local
mode, the converter is controlled from the front panel. The cursor is present only in the Local
mode.
2.1 FRONT PANEL CONTROLS
The front panel of the 9400 Series Modulation Upconverter is divided into the functional groups
shown in Figure 1.
Figure 1. Front Panel, 9400 Series Modulation Upconverter

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2.2 FREQUENCY
To set the frequency of the converter:
A. Using the ‘FUNCTION SELECT” key, locate the cursor in the frequency field.
B. With the cursor in the frequency field enter the desired frequency (in MHz)
using the numbered keys and the decimal point.
C. Press “ENT”.
2.3 ATTENUATION
To set the attenuation of the converter:
A. Using the "FUNCTION SELECT" key, locate the cursor in the attenuation
field.
B. Enter the desired attenuation (0.2 dB steps) using the numbered keys and
the decimal point.
C. Press "ENT".
D. The up and down arrow keys may also be used to step the attenuation in
0.2 dB steps.
2.4 MODULATION WAVEFORM TYPE
To set the modulation waveform type of the converter:
A. Using the "FUNCTION SELECT" key, locate the cursor in the modulation
field.
B. Use the up and down arrow keys to step through the available modulation
waveform types.
C. Press "ENT".
2.5 MODULATION RATE
To set the modulation rate of the converter:
A. Using the "FUNCTION SELECT" key, locate the cursor in the modulation
rate field.
B. Enter the desired modulation rate (in Hz) using the numbered keys.
C. Press "ENT".

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2.6 OUTPUT DEVIATION
To set the output deviation of the converter:
A. Using the "FUNCTION SELECT" key, locate the cursor in the deviation field.
B. Enter the desired output deviation (in kHz) using the numbered keys and
the decimal point.
C. Press "ENT".
2.7 CHANNEL MEMORY
The converter has thirty-two memory locations numbered 00 to 31. Each location stores a
frequency, an attenuation setting, a modulation waveform type, a modulation rate and an
output deviation.
To store a setup in memory:
A. Enter the desired frequency (in MHz) using the numbered keys and the
decimal point. Press "ENT" only to tune the converter to the displayed
frequency, otherwise, press "FUNCTION SELECT" to move the cursor into
the attenuation field.
B. Enter the desired attenuation (0.2 dB steps) using the numbered keys and
the decimal point. Press "ENT" only to set the converter to displayed
attenuation, otherwise, press "FUNCTION SELECT" to move the cursor into
the modulation waveform type field.
C. Set the modulation waveform type using the arrow keys. Press "ENT" only
to tune the converter to the displayed modulation waveform type, otherwise,
press "FUNCTION SELECT" to move the cursor into the modulation rate
field.
D. Set the modulation rate (in Hz) using the numbered keys. Press "ENT" only
to tune the converter to the displayed modulation rate, otherwise, press
"FUNCTION SELECT" to move the cursor into the output deviation field.
E. Set the output deviation (in kHz) using the numbered keys and the decimal
point. Press "ENT" only to tune the converter to the displayed output
deviation.
F. Press "STR" and enter the memory number using the numbered keys (two
digits). The cursor will be in the setup field during this key sequence.
G. Press "ENT" to set the converter to these values. If "ENT" is not pressed the
display will time-out after approximately five seconds and return to the
current converter settings.

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To recall a setup from memory:
A. Press "RCL".
B. Enter the memory number using the numbered keys (two
digits). The cursor will be in the setup field during this key sequence. The
stored values will appear in their respective fields in the display.
C. Press "ENT" to set the converter to these values. If "ENT" is not pressed the
display will time-out after approximately five seconds and return to the
current converter settings.
2.8 ALARM STATUS
If any alarms exist, at any time, the red alarm LED will light. Alarm status can be examined in
both Local and Remote modes.
To examine converter alarm status:
A. Press "ALARM".
B. The alarm status will be displayed for approximately five seconds, or as long
as the "ALARM" key is held, after which the display will return to the current
converter settings.
2.9 DC VOLTAGES
DC voltages can be examined in both Local and Remote modes.
To examine DC voltages:
A. Enable the shift functions (blue text). The "SHIFT" key enables (LED On)
and disables (LED Off) the shift functions. The mode toggles with each
"SHIFT" key press.
B. Press "VOLTAGE MONITOR" (normally "STR"). The power supply voltages
will be displayed until another key is pressed.
C. Press "VOLTAGE MONITOR" (normally "STR") again to examine the phase
voltages.
D. Press any other key to resume normal display. The shift functions will
become disabled.

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2.10 LOCAL MUTE FUNCTION
To mute the converter (if applicable):
A. Press "STR" and enter the digits "99" using the numbered keys. The word
"MUTED" will appear in place of the attenuation setting.
To unmute the converter (if applicable):
A. Press "RCL" and enter the digits "99" using the numbered keys. The
attenuation setting will reappear in place of "MUTED" in the attenuation
field provided no alarms exist.
2.11 CONTRAST ADJUST
To adjust the contrast for viewing angle:
A. Press "STR" followed by "FUNCTION SELECT".
B. Press and hold either arrow key. Pressing the up arrow darkens the display;
the down arrow lightens the display.
C. Press any other key to return the display to normal operation. The display
will time-out and resume normal operation after approximately five seconds
if no key is pressed.
2.12 SUMMARY ALARM
Asummary alarm condition exists when one or more of the component faults (Para. 3.2.2.4)
indicate a failure. For upconverters, the mute function will be activated and the word "MUTED"
will appear in place of the attenuation setting. The summary alarm, when activated, overrides
an UNMUTE command and will automatically be cleared when all components return to the
normal condition.
2.13 REMOTE COMMUNICATION FORMAT
The remote communication format can be examined in both Local and Remote modes.
To examine the remote communication format:
A. Enable the shift functions (blue text). The "SHIFT" key enables (LED On)
and disables (LED Off) the shift functions. The mode toggles with each
"SHIFT" key press.
B. Press "FORMAT" (normally "RCL"). The remote communications format will
be displayed.
C. The remote communication format will be displayed for approximately five
seconds, or long as the "FORMAT" key is held, after which the display will
time-out and resume normal operation.

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To change the remote communication format:
A. Hold down the "FORMAT" key during power-up of the converter.
B. Use the arrow keys to vary each parameter and the "ENT" to set each
parameter.
C. To resume normal operation cycle the converter power off and on.
3.1 REMOTE OPERATION
3.1.1 DEVICE ADDRESS/BAUD RATE/PARITY SELECTION
To change the remote communication format:
A. Hold down the "FORMAT" key during power-up of the converter.
B. Use the arrow keys to vary each parameter and the "ENT" to set each
parameter.
C. To resume normal operation, cycle the converter power off and on.
3.1.1.1 ADDRESS SELECTION
Use the arrow keys to scan through the valid addresses and the "ENT" key to select the
desired address.
3.1.1.2 BAUD RATE SELECTION (NOT APPLICABLE FOR IEEE-488)
Use the arrow keys to scan through the available baud rates, and the "ENT" key to select the
desired baud rate. The baud rates available are:
Baud Rates:
300
600
1200
2400
4800
9600
19200
3.1.1.3 Parity Selection (Not Applicable For IEEE-488)
Use the arrow keys to toggle between odd and even parity.

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3.2 RS422/485/232 PROTOCOL
All transmissions are multi-byte sequences beginning with a header byte, and ending with a
trailer byte and checksum byte. The transmitted bytes are all ASCII printable characters in the
range of 20H to 7AH.
Data transmission format is a 10 bit sequence consisting of 1 Start, 7 Data, 1 Parity and 1 Stop
bit. To set odd or even parity see Paragraph 3.4. All characters, including the checksum
character, are checked for parity. If any character in the message has a parity, framing or
overrun error, the entire message is ignored and no response is made by the converter.
All messages addressed to the converter are normally acknowledged with a response
message. Before sending the response message a converter configured for RS422 will check
for no activity on the communication bus for a period of at least one character time. If the bus
is active, the response message will be cancelled. This allows a controller to rapidly update a
number of devices on the communication bus without having to wait for a response. When
using this method (available only for RS422) the following restrictions apply:
- Minimum command update period is 100 msecs.
- Multiple commands may not be sent without waiting for a response from each
command.
The converter continually monitors the communications bus and will accept all commands
addressed to it even when in Local mode. When in Local mode, receipt of any commands
other than Status All or Status Faults will be ignored and the converter will respond with an
error code.
3.2.1 DATA TRANSFER
The general message format is as follows:
HEADER - DEVICE ADDRESS - COMMAND/ERROR CODE -
PARAMETERS (if required) - TRAILER - CHECKSUM
The response time from Command to acknowledge is 100 ms. maximum.
Since all bytes are ASCII printable characters, a compatible terminal may be used to control
the converter or monitor traffic on the communication bus.
3.2.1.1 HEADER BYTE
The Header byte is 7BH, ASCII character "{".
3.2.1.2 DEVICE ADDRESS BYTE
There are thirty-two possible addresses. The valid device address range is from 40H to 5FH.

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3.2.1.3 COMMAND/ERROR CODES
COMMAND CODES
ASCII
Code Character Function
46H F Frequency Set
54H T Attenuation Set
45H E Memory Store
53H S Memory Store and Set
4CH L Memory Recall
52H R Memory Recall and Set
4DH M Mute
55H U Unmute
41H A Status All
3FH ? Status Faults
43H C Combination Command
56H V Deviation Set
57H W Mod. Type Set
58H X Mod. Rate Set
ERROR CODES
ASCII
Code Character Function
61H a Command not recognized
62H b Illegal parameter or parameter out of range
63H c Unit in Local mode
64H d Busy

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3.2.1.4 PARAMETER BYTES
Parameters are numeric characters which are sent MSD first, LSD last. Non-numeric
parameters such as ",", "." or values beyond the range of the converter will be rejected and
cause the converter to respond with error code "b".
3.2.1.5 TRAILER BYTE
The Trailer byte is 7DH, ASCII character "}".
3.2.1.6 Checksum Byte
The Checksum byte is the sum modulo 95 of all message characters beginning with the
header byte up to and including the trailer byte.
The value 32 is subtracted from each character value before taking the modulo 95 sum. The
value 32 is added to the final sum to obtain the Checksum value. All
values are in decimal.
Checksum = Mod [(character value - 32), 95] + 32
3.2.2 COMMAND CODES
The following paragraphs describe each of the command codes.
3.2.2.1 FREQUENCY CODE = F
The Frequency command requires a seven or eight digit parameter which sets the frequency
of the converter in kHz. Assuming no error conditions, the converter is set to the frequency
and unmuted.
Remote Command Sequence (8 Digit): F14000500
(7 Digit): F3705000
Converter Response: F
3.2.2.2 MUTE CODE = M (IF APPLICABLE)
The Mute command requires no parameters. The output of the converter is muted until a
Frequency or Unmute command is received.
Remote Command Sequence: M
Converter Response: M