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Miteq 9400 Series Manual

Local/remote control test translator
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MITEQ TECHNICAL NOTE 25T027
TEST TRANSLATOR (9400 SERIES)
_____________________________
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.
LOCAL/REMOTE CONTROL
SEPTEMBER 1998
REV C

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  • Page 1 MITEQ TECHNICAL NOTE 25T027 SEPTEMBER 1998 REV C LOCAL/REMOTE CONTROL TEST TRANSLATOR (9400 SERIES) _____________________________ 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).

  • Page 2: Front Panel Controls

    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.

  • Page 3: Channel Memory

    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.

  • Page 4: Alarm Status

    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"...

  • Page 5: Summary Alarm

    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.

  • Page 6: Address Selection

    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.
  • Page 7 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.
  • Page 8 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 "}".
  • Page 9 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...
  • Page 10 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.
  • Page 11 3.2.2.7 STORE CODE = E The Store command stores the specified LO frequency and an attenuation or RF input selection in the selected memory location. The actual setting of the unit is not changed. Remote Command Sequence: EnnFfffffff(f)TtttIi Response: E E = Store indicator nn = Two digit ASCII numeric character indicating a memory location.
  • Page 12 3.2.2.9 RECALL CODE = L The Recall command returns the LO frequency and attenuation or RF input selection stored in the selected memory location. The actual setting of the unit is not changed. Remote Command Sequence: Lnn Response: LnnFfffffff(f)TtttIi L = Recall indicator nn = Two digit ASCII numeric character indicating a memory location.
  • Page 13 3.2.2.11 RF INPUT SELECT CODE = I The RF Input select command selects the RF input from Input 1 or Input 2. Remote Command Sequence: Ii Response: I I = RF Input indicator i = 0 = IN1, 1 = IN2 3.2.2.12 COMBINATION FREQUENCY AND ATTENUATION SET CODE = C The Combination Set command sets the LO frequency, attenuation and optionally the RF input with one command.

  • Page 14: Programming Examples

    3.2.3 PROGRAMMING EXAMPLES The unit address is 41H (ASCII Code A). The following are typical commands and responses showing the ASCII printable characters. A. Set the LO frequency to 2.050 GHz Controller Command Response {AF2050000}y {AF}a or possible error code {Ac}∼...
  • Page 15 The command and status bits are represented in Binary Coded Decimal format. Momentarily connecting the appropriate weighted bits for a stored setting to COM (Gnd) will cause the unit to assert the settings stored in that memory location. The status bits will indicate the recognition of a valid command by asserting the appropriate weighted bits.

  • Page 16: Data Format

    3.5.2.4 RECALL AND SET CODE = R or C This message sets the unit to the values previously stored in channel memory "nn". The Mute status is not affected. Remote Command Sequence: Rnn or Cnn R or C = Recall and Set indicator nn = Two digit ASCII numeric character indicating a memory location.
  • Page 17 3.5.2.7 STATUS FAULTS FORMAT = D? Data Format Response ?abcdef ? = Status indicator a-f = 0 = No Fault, 1 = Fault a through f indicate the status of the six component fault lines. Synthesizer Alarm LOA Alarm LOB Alarm Power Supply Alarm LO1 Level Detect LO2 Level Detect...
  • Page 18 3.5.2.11 STORE CODE = E The Store command stores the specified LO frequency and an attenuation or RF input selection in the selected memory location. The actual setting of the unit is not changed. Remote Command Sequence: EnnFfffffff(f)TtttIi E = Store indicator nn = Two digit ASCII numeric character indicating a memory location.

  • Page 19: Service Request

    3.5.2.14 COMBINATION FREQUENCY AND ATTENUATION SET CODE = C The Combination Set command sets the LO frequency, attenuation and optionally the RF input with one command. The Mute status is not affected. Remote Command Sequence: CFfffffff(f)Tttt(Ii) C = Combination Command indicator F = LO frequency indicator fffffff(f) = Seven or eight digit LO frequency T = Attenuation indicator...
  • Page 20 RS232C - J6-1 Ground TX Data RCV Data Ground Contact Closure (DB25S) - Commands Status Indicator Contacts J6-1 Setup 14 J6-7 Remote Setup 08 Common Setup 05 Local Setup 02 Remote: J6-7 - J6-8 Closed Setup 01 J6-9 - J6-8 Open Local: J6-9 - J6-8 Closed Setup 06...
  • Page 21 Example: To select the settings stored in Memory Location 31, J6 Pins 21, 8 and 6 must be asserted low while the unit is in Remote mode and the cable supervision bit is asserted low. Upon recognition and acceptance of this command J6 Pins 16, 3 and 1 will go low. These status bits will remain valid until either the cable supervision bit is disconnected, the unit is put into Local mode, or another valid command is accepted.
  • Page 22 M:\TECHNOTE\25T027.DOC...

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