Miteq 9400 Series Manuale utente
MITEQ TECHNICAL NOTE 25T027 SEPTEMBER 1998
REV C
LOCAL/REMOTE CONTROL
TEST TRANSLATOR (9400 SERIES)
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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 unit 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 unit cannot be set to Remote mode from the front panel “REMOTE” key. It will
automatically go to Remote mode when it is addressed by the IEEE-488 system controller.
Pressing the key will return to the Local mode.
Remote mode locks out the front panel and allows control of the unit only from the remote bus.
Status can still be monitored locally. Any attempt to alter the settings while in Remote mode,
causes the error tone to sound and will be ignored. In Local mode, the unit is controlled from
the front panel. The cursor is present only in the Local mode.
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2.1 FRONT PANEL CONTROLS
The front panel is divided into the functional groups shown in Figure 1.
Figure 1. Front Panel, Test Translator 9400 Series
2.2 LO FREQUENCY (TRANSLATION FREQUENCY)
To set the LO frequency:
A. Using the "FUNCTION SELECT" key, locate the cursor in the LO frequency field.
B. With the cursor in the LO frequency field enter the desired frequency (in GHz) using
the numbered keys and the decimal point. The LO frequency can also be changed
by using UP or DOWN keys. For dual frequency conversion units, the LO frequency
will be the translation frequency between the input and output bands. The
frequency of the internal oscillators may be different from the LO frequency for dual
conversion units.
C. Press "ENT".
2.3 ATTENUATION (If Applicable)
To set the attenuation:
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".
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D. The up and down arrow keys may also be used to step the attenuation
in 0.2 dB steps. The “up” arrow will increase attenuation and the “down”
arrow will decrease attenuation. If the key is held, the attenuation will
continue to change until the key is released or the limit is reached.
2.4 RF INPUT SELECTION (If Applicable)
To select the input:
A. Using the “FUNCTION SELECT” key, locate the cursor in the input field.
B. Press either arrow key to toggle the input selection between IN1 and IN2 , or enter
“1” or “2” directly.
C. Press "ENT".
2.5 CHANNEL MEMORY
There are thirty-two memory locations numbered 00 to 31. Each location stores a LO
frequency and an attenuation or RF input setting together.
To store a setup in memory:
A. Enter the desired LO frequency (in GHz) using the numbered keys and the decimal
point. Press "ENT" only to tune to the displayed LO frequency, otherwise press
"FUNCTION SELECT" to move the cursor into the next field.
B. If applicable, enter the desired attenuation (0.2 dB steps) using the numbered keys
and the decimal point. Press "ENT" only to set to the displayed attenuation,
otherwise press "FUNCTION SELECT" to move the cursor into the next field.
C. If applicable, select the desired RF Input selection “IN1” or “IN2” by pressing UP or
DOWN keys, or enter “1” or “2” directly. Press "ENT" only to set to the displayed RF
Input, otherwise press "FUNCTION SELECT" to move the cursor into the next field.
D. 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.
E. Press "ENT" to set the unit to these values. If "ENT" is not pressed the display will
time-out after approximately five seconds and return to the current settings.
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 unit to these values. If "ENT" is not pressed the display will
time-out after approximately five seconds and return to the current settings.
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2.6 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 the 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 settings.
2.7 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 force the display to resume its normal display. The
shift functions will become disabled.
2.8 LOCAL MUTE FUNCTION (If Applicable)
To mute:
A. Press "STR" and enter the digits "99" using the numbered keys. The word
"MUTED" will appear in place of the attenuation value in the attenuation field.
To unmute:
A. Press "RCL" and enter the digits "99" using the numbered keys. The attenuation
value will reappear in place of "MUTED" in the attenuation field provided no alarms
exist.
2.9 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.
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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.
2.10 SUMMARY ALARM
A summary alarm condition exists when one or more of the component faults (Para. 3.2.2.4)
indicate a failure. If applicable, the mute function will be activated and the word "MUTED" will
appear in place of the attenuation value in the attenuation field. The summary alarm when
activated, overrides an UNMUTE command, and will automatically be cleared when all
components return to the normal condition.
2.11 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.
To change the remote communication format:
A. Hold down the "FORMAT" key during power-up of the unit.
B. Use the arrow keys to vary each parameter and the "ENT" to set each
parameter.
C. To resume normal operation, cycle the 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 unit.
B. Use the arrow keys to vary each parameter and the "ENT" to set each
parameter.
C. To resume normal operation, cycle the power off and on.
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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, 19.2K
3.1.1.3 PARITY SELECTION (Not Applicable for IEEE-488)
Use the arrow keys to scan through Odd, Even and No Parity, and the "ENT" key to select the
desired parity.
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 the parity see Paragraph 3.1. 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.
All messages addressed to the unit are normally acknowledged with a response message.
Before sending the response message a unit 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 canceled. 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 will apply:
- Minimum command update period is 100 msecs.
- Multiple commands may not be sent without waiting for a response from each
command.
The unit continually monitors the communication 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 unit will respond with an error code.
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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 unit 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.
3.2.1.3 COMMAND/ERROR CODES
COMMAND CODES
ASCII
Code Character Function
46H F LO Frequency Set
49H IRF Input 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 CCombination Command
42H BBand 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 unit will be rejected and cause
the unit 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 LO FREQUENCY CODE = F
The LO Frequency command requires a seven or eight digit parameter which sets the LO
frequency in kHz. Assuming no error conditions, the unit is set to the LO frequency and
unmuted.
Remote Command Sequence: Ffffffff(f)
F = Frequency indicator
fffffff(f) = Seven or eight digit frequency in kHz
Response: F
3.2.2.2 MUTE CODE = M (If Applicable)
The Mute command requires no parameters. The output of the unit is muted until a LO
Frequency or Unmute command is received.
Remote Command: M
Response: M
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3.2.2.3 STATUS ALL CODE = A
The Status All command requires no parameters. The unit responds in both Local and
Remote mode with the LO frequency, attenuation, remote/local status, RF input selection,
mute status and component fault status.
Remote Command: A
Response: AFfffffff(f)TtttLlIiMm?abcdef
A = Status All indicator
F = LO frequency indicator
fffffff(f) = Seven or eight digit ASCII numeric character indicating LO frequency.
T = Attenuation indicator
ttt = Attenuation in 0.2 dB steps (decimal point omitted)
L = Local/Remote indicator
l = "0" or "1" ASCII numeric character
0 = Local
1 = Remote
I = RF Input indicator
i = “0” or “1” ASCII numeric character
0 = IN1
1 = IN2
M = Mute indicator
m = "0" or "1" ASCII numeric character
0 = Mute Off
1 = Mute On
? = Component Fault Status indicator
a-f = "0" or "1" ASCII numeric character
0 = No fault
1 = Fault
a through f indicates the status of the six component fault lines.
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3.2.2.4 STATUS FAULTS CODE = ?
The Status Faults command requires no parameters. The unit responds in both Local and
Remote mode with the component fault status.
Remote Command: ?
Response: ?abcdef
? = Component Fault Status indicator
a-f = "0" or "1" ASCII numeric character
0= No fault
1 = Fault
a through f indicate the status of the six component fault lines.
a Synthesizer Alarm
b LOA Alarm
c LOB Alarm
d Power Supply Alarm
e IF-LO Level Detect
f RF-LO Level Detect
3.2.2.5 ATTENUATION CODE = T
The Attenuation command requires a three digit parameter which sets the attenuation in 0.2
dB steps. The attenuation is immediately set without affecting Mute status.
Remote Command Sequence: Tttt
Response: T
T = Attenuation indicator
ttt = Attenuation in 0.2 dB steps (decimal point omitted)
3.2.2.6 UNMUTE CODE = U
The Unmute command requires no parameters. It will activate the unit's output unless a fault
condition exists.
Remote Command Sequence: U
Response: U
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