Miteq LN Series User manual

100 Davids Drive
Hauppauge, New York 11788-2034
Tel: [phone]
Fax: [phone]
www.miteq.com
MITEQ TECHNICAL NOTE 25T042 APRIL 2007
REV G
REDUNDANT LOW NOISE AMPLIFIER UNIT
(LN-SERIES)
_________
SECTION 1
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL
Figure 1-1. Front Panel Configurations

2
Figure 1-2. Rear Panel Configurations
1.1.2 FUNCTIONAL
The redundant Low Noise Amplifier (LNA) unit is used to provide automatic signal protection in
a redundant low noise amplifier system. There are two operating modes, Manual and Auto. In
Manual mode the operator has control of the transfer switches. With the control unit in Auto
mode, a fault condition in an on-line LNA would generate an automatic switchover to a standby
LNA.
The Redundant Amplifier Unit is available in a 1:1, Dual 1:1, or 1:2 configuration. The 1:1 unit
provides one on-line amplifier with one standby amplifier. The Dual 1:1 unit provides two
independent 1:1 configurations in one box. The 1:2 unit provides two on-line amplifiers with one
standby amplifier. All models are equipped with two redundant hot swappable power supplies
and a remote interface for monitoring and control via a remote computer. The design provides
for continuous operation during fault repair or routine maintenance. Among the features are a
32 entry Event Log, switch and power supply monitoring. A 100 foot cable is provided for
connection to the antenna mount amplifier/switch assembly.
1.2 EQUIPMENT CHARACTERISTICS
1.2.1 MECHANICAL
MECHANICAL
Weight (Controller).........................................................................................12 pounds nominal
Weight (Amplifier Assembly)................................ 15 to 30 pounds typical, depending on model
Overall Dimensions (Controller).............................................. 19” x 1.75” panel x 22” maximum
Primary power........................................................................................................... 90-250VAC
Primary power input.........................................................................................................IEC320
Fuse.................................................................................................................. 5x20mm (T1.0A)
0
0
0 0
0
0

3
Remote interface connectors (J2, J3)
RS422/RS485 (Standard).............................................................................................. DE-9S
RS232 (Option 17C) .................................................................................................... DB-25P
Contact Closure...........................................................................................................DC-37S
IEEE-488..................................................................................................IEEE-488 receptacle
1.2.2 ENVIRONMENTAL
Operating
Ambient temperature (Controller) ............................................................................0 to +50°C
Ambient temperature (Amplifier/Switch Assembly)...............................................-30 to +60°C
Atmospheric pressure................................................................................... Up to 10,000 feet
Relative humidity.........................................................................................Up to 95% at 30°C
Non-operating
Temperature .........................................................................................................-50 to +70°C
Atmospheric pressure................................................................................... Up to 40,000 feet
Shock and vibration ...................................................Normal handling by commercial carriers
Relative humidity.........................................................................................Up to 95% at 40°C

4
SECTION 2
2.0 INSTALLATION
2.1 UNPACKING, STORAGE, RESHIPMENT
Carefully open the shipping container and remove the equipment. Inspect the equipment
thoroughly and report any damage.
If the equipment is to be stored, it should be wrapped in plastic and kept in a clean, dry place.
If the equipment is to be reshipped for any reason, wrap in heavy plastic and ship in a heavy
(275 lb. test) double wall carton. At least three inches of a solid packing material should be
used on all sides of the unit. The carton should be marked to indicate that it contains fragile
electronic equipment.
2.2 MOUNTING
THIS EQUIPMENT IS NOT FOR USE IN A DOMESTIC ENVIRONMENT.
THE CONTROLLER IS INTENDED FOR RACK MOUNTING. THE AMPLIFIER/SWITCH
ASSEMBLY IS INTENDED FOR REMOTE MOUNTING.
OPERATOR INJURY MAY OCCUR IF UNIT IS NOT PROPERLY MOUNTED.
THIS EQUIPMENT MUST BE SECURELY MOUNTED.
Slides are provided for mounting the controller in a standard 19" equipment rack.
2.3 TURN-ON PROCEDURE
After mounting, make all external connections per Table 2-1.
Apply power to the equipment by pressing the rear panel power On/Off switches.
System is now operational.

5
DESIGNATION DESCRIPTION
Ground Lug Connect the ground lug on the rear panel of the equipment to the
Protective Earth connection of the building.
Power Cords Attach power cords to the rear panel AC power inlets marked “PSA”
and “PSB”. Connect the other end to the power source. Refer to
national wiring standards for the correct connection to the power
source.
Summary Alarm
Connector (J1) The Summary Alarm connector is a contact closure status output indicating the status of the unit and also it’s power supplies. See
Paragraph 2.8 for wiring information.
Remote Interface
Connector (J2) The Remote Interface connector is an optional connection. This allows the operator to monitor and control the equipment from a
remote location.
Interface Cable The cable is used to connect the controller and switch/amplifier
assembly together.
Table 2-1. External Connections
2.4 AMPLIFIER REPLACEMENT PROCEDURE
A replacement amplifier can have different current high and low limits, even if it is otherwise
identical to the failed amplifier. Refer to the amplifier data sheet for it’s ambient current draw,
and set the current limits to +/- 20% of that level.
See Paragraph 3.2.7 in the display operation section of this document for details regarding how
to set the current limits.
2.5 POWER SUPPLY REPLACEMENT PROCEDURE
Because of the interchangeability of PSA (Power Supply A) and PSB (Power Supply B), refer to
Section 1.1.1 for power supply positions.
• Turn off the power supply you wish to replace.
• Remove its line cord.
• Turn the black knob counter clockwise until the power supply comes loose.
• Pull the power supply by hand using the same knob as above.
• Place the new power supply in the same orientation as the old one. The power supplies in
this unit are slotted to insure proper orientation.
• Slide the power supply in by hand.
• Turn the black knob clockwise until it is hand tight.
• Attach the line cord.
• Turn on the power supply and verify proper operation.

6
SECTION 3
3.0 DEFINITIONS
3.0.1 ACTIVE ALARM
An Active Alarm is a Redundant Low Noise Amplifier Unit (RLNAU) generated fault, which
indicates that the unit is presently detecting a fault.
The Active Alarms that can be reported are:
• An amplifier alarm is active while the current drawn by the amplifier exceeds the current
limits programmed into the unit for that amplifier. From the factory, the current limits are
set at +/- 20% of the nominal current draw at ambient.
• A power supply alarm is active when a power supply exceeds +/- 8% of the nominal
voltage rating at ambient temperature. Power supply A and power supply B both have a
5.5V and a 24.5V supply; for the 5.5V source, the range is 5.0V to 6.0V, and for the
24.5V source, the range is 22.5V to 26.5V.
• A switch alarm is active if a switch is detected in a position other than what was
expected. Switch alarms are suppressed during switch operations.
Alarms are suppressed for the first second after startup to make sure that all alarm detectors
have become stable.
3.0.2 AMPLIFIER CURRENT LIMITS
Current limits vary from amplifier to amplifier. Amplifier Current Limits are set at the factory. It
is recommended that Amplifier Current Limits be changed by an operator only when an amplifier
is being replaced in the field.
3.0.3 PRIMARY AMPLIFIER
A Primary Amplifier is intended to remain On-line during normal operation. If a Primary
Amplifier fails and the backup amplifier is available, the Primary Amplifier will be switched into
Standby and the Backup Amplifier will be switched On-line in its place.
• In a 1:1 configuration Amplifier A1 is the Primary Amplifier.
• In a Dual 1:1 configuration Amplifier A1 and A3 are Primary Amplifier and Amplifier ‘C’ is
a Primary Amplifier.
• In a 1:2 configuration Amplifier A1 and Amplifier A2 are both Primary Amplifiers.

7
3.0.4 BACKUP AMPLIFIER
A Backup Amplifier is intended to remain in standby during normal operation. In the event of a
primary amplifier fault the Backup Amplifier will be switched On-line and the primary amplifier is
switched into standby.
• In a 1:1 configuration Amplifier ‘B’ is the Backup Amplifier.
• In a Dual 1:1 configuration Amplifier ‘B’ is a Backup Amplifier and Amplifier ‘D’ is a
Backup Amplifier.
• In a 1:2 configuration Amplifier ‘C’ is the Backup Amplifier.
3.0.5 ERROR TONE
A beep lasting for one second, indicating an invalid key press or a screen timeout.
3.0.6 ON-LINE
An amplifier is considered On-Line if it is switched into an input/output signal path.
3.0.7 STANDBY STATUS
An amplifier is considered in Standby if is not switched into an input/output signal path.
3.1 OPERATING MODES
The operating modes of the RLNAU are selected from the front panel (in Local mode) or over
the remote bus (in Remote mode).
3.1.1 AUTO MODE
In Auto mode the On-line/Standby status of the amplifiers is controlled automatically without
operator intervention. Amplifier path control is locked out from both the front panel and the
remote bus.
In Auto Mode, switching is the direct result of a change in amplifier alarms. Switching from
Manual to Auto Mode will cause any existing amplifier alarms to be treated as new alarms for
switching purposes.

8
Automatic Switching Decision Process for a Failed Amplifier
** This is only available in a 1:2 model, otherwise pass directly on to top of flowchart without switching.
Figure 3-1.
3.1.2 MANUAL MODE
When the RLNAU is in the Manual mode the On-line/Standby status of the RLNAU can be
controlled from the front panel when in unit is in the LOCAL mode. The On-line/Standby status
can be controlled over the remote bus when the unit is in the REMOTE mode. Amplifier faults
are still monitored and reported but they will have no effect on the On-line/Standby switch
status.
3.1.3 LOCAL MODE
When the RLNAU is in the LOCAL control mode operational functions and parameters can be
controlled and entered from the front panel. Remote control of those functions and parameters
is locked out. However, the control unit will still respond to remote monitoring of RLNAU
operation .
No
Yes
No
No
No
Yes Yes
Yes
Begin
Switch Backup Amplifier
On-Line
** Switch Backup Amplifier
in from low priority online
path to high priority Online
Unit in
Auto
mode
A Primary
Amplifier
has Failed
A Backup
Amplifier is
available
Any other
unit fault
have greater
priority?

9
3.1.4 REMOTE MODE
When the RLNAU is in the Remote control mode operational functions and parameters can only
be controlled from the remote bus. All control and parameter values can be viewed from the
front panel. Changes to control and parameter values are locked out. The event log and any
active alarms can be examined while the unit is in the Remote control.
3.2 FRONT PANEL
The front panel has been organized so that important information is available at a glance.
Control functions and additional status information is available through a menu system and the
front panel LCD.
3.2.1 STATUS INDICATORS
Amplifier symbols have tricolor LEDs that display the status of each amplifier. Green light,
indicates normal on-line operation, amber light, indicates normal stand-by mode. The on-line or
standby amplifier LED will turn red if a fault is detected on that amplifier.
Transfer switch symbols have bicolor LEDs. Green lights display the switch transmission path,
unless there is a switch fault, then all LEDs associated with that switch will turn red.
The Power LED will light green when power is applied to the unit.
The Alarm LED will light red indicating an Active Alarm.
The Remote LED will light amber if the unit is in Remote Mode.
Manual or Auto LED’s will light up if the unit is in Manual Mode or Automatic Mode respectively
.
3.2.2 FRONT PANEL OPERATION
3.2.2.1 KEYPAD OPERATION
ENTER Key confirms entries. In most cases, data entry must be confirmed with an ENTER key
press. Any exceptions (e.g. Contrast) will be noted in that section.
MENU Key brings up Main Menu, or escapes out of current mode. If a change is pending
(needs confirmation), this key cancels the change without implementing it. When the unit is not
waiting on a confirmation, or the Screen has nothing that can be changed, the MENU key
displays the Main Menu.
REMOTE Key: this key chooses the Remote/Local Screen and changes the Remote/Local
Control Mode (an ENTER key press is needed to accept the selection).
MANUAL Key: this key chooses the MANUAL/AUTO Screen. and changes the Auto/Manual
Mode (an ENTER key press is needed to accept the selection).
ALARM Key: brings up the Alarm Menu, which includes a list of any Active Alarms and the
Event Log.
LEFT and RIGHT Keys: provides cursor navigation within a menu screen.

10
UP and DOWN Keys: provides navigation to different menu screens, when the cursor is a right
arrow the ↑↓ keys cycle through parameter choices.
3.2.2.2 LIQUID CRYSTAL DISPLAY
The Liquid Crystal Display (LCD) is organized as two rows consisting of sixteen characters
each. The LCD will display all system information and respond to all local commands available
through the front panel keypad.
3.2.2.3 BEEP OPERATIONS
A valid key press will be acknowledged with a short beep. An error tone (longer beep) will
sound with any invalid key press, parameter timeout or Display Timeout.
3.2.2.4 DISPLAY TIMEOUT
After a 50-second period without any keys being pressed, the display reverts to the default
screen and a one second beep will sound.
When the cursor is blinking, further input is required from the user. If five seconds pass without
a key press, then an error tone will sound and the blinking cursor will revert to an arrow.
3.2.2.5 CURSOR OPERATIONS
The cursor will take one of two forms: an arrow or a blinking square. The arrow cursor passively
indicates the next field to be selected; settings cannot be changed while in this form. The
blinking square cursor is present when additional keypad is expected. Without any input from
the user, the blinking square cursor will timeout and return to its arrow form.
3.2.3 MENUS AND SCREENS
3.2.3.1 DEFAULT SCREEN
If not already displayed, use the MENU key to access the default screen.
*
Exact Model number and description vary model to model.
The default screen displays the redundancy configuration and model number of the unit. At
start-up, the unit defaults to this screen. In addition, if another screen is active and a 50-second
time period expires without any key presses, the unit will default to this screen.
If a new alarm has been logged a message is briefly displayed on the default screen. This
message will expire after any key is pressed.
1:1 AMP SYSTEM
*
*

11
3.2.3.2 MAIN MENU
If not already displayed, use the MENU key to access the Main Menu.
The Main Menu is a series of screens that provide access to functions that do not have a
dedicated key. Use the up and down arrow keys to scroll through the Main Menu screens in the
order listed below.
SCREEN FUNCTION
“ On-line/Standby ” Select On-line paths for amplifiers.
“ (Press ENTER) “
“Current Monitor ” Display Current levels of all amplifiers.
“ (Press ENTER) “
“Voltage Monitor “ Display Voltage levels of both power supplies.
“ (Press ENTER) “
“ Current Limits “ Display/Set current limits of amplifiers.
“ (Press ENTER) “
“ Remote Format “ Display/Set Remote communication settings.
“ (Press ENTER) “ (RS232, RS422, RS485, and IEEE-488 options only)
“Contrast Adjust ” Adjust contrast.
“ (Press ENTER) “
"Channel Priority“ Display/Set amplifier priority.
“ (Press ENTER) “ (1:2 model only)
“ Date/Time “ Display/Set real time clock.
“ (Press ENTER) “
Example of a Main Menu screen:
Select a Screen:
• Use the UP or DOWN keys to navigate to a screen.
• Press the ENTER key to select that screen.
ONLINE/STANDBY
(Press ENTER)
↑
↓

12
3.2.3.3 ON-LINE/STANDBY SCREEN
Use the MENU and arrow keys to select the ON-LINE/STANDBY screen, then press ENTER.
To Change On-line/Standby Status:
• Point the arrow cursor to the desired amplifier status. The UP and DOWN keys move the
arrow cursor. If that amplifier is not on the display (for the 1:2 and Dual 1:1 models only),
the other amplifier(s) may be reached by using the DOWN key.
• Use the RIGHT key to select that amplifier.
• Use the UP and DOWN keys to change the On-line/Standby Status of that amplifier (the
associated amplifiers will change accordingly).
• Press the ENTER key to confirm selection.
3.2.3.4 CURRENT MONITOR SCREEN
Use the MENU and arrow keys to select the CURRENT MONITOR screen, then press ENTER.
*Exact current levels vary model to model.
This screen updates to provide the latest readings from the current monitor of the amplifiers.
See Section 3.0 for a definition of current limits.
To View Other Amplifiers:
(For the 1:2 and Dual 1:1 Models Only)
• UP and DOWN keys move the information up and down to display the other amplifier current
levels.
A1: 155 mA
*
A2: 133 mA*
«A1 A2
ON ST

13
3.2.3.5 VOLTAGE MONITOR SCREEN
Use the MENU and arrow keys to select the VOLTAGE MONITOR screen, then press ENTER.
* Slight variation should be expected.
This screen updates to provide the latest readings from the voltage monitors of the power
supplies. The two digit fields on the left side of the LCD indicate the measured voltage of the
5.5V source of each power supply. The three digit fields on the right indicate the level of the
24.5V source for each power supply.
No adjustments can be made from this screen.
3.2.3.6 CURRENT LIMIT SCREEN
Use the MENU and arrow keys to select the CURRENT LIMIT screen, then press ENTER.
The initial Amplifier Current Limits are set in the factory. It is recommended that Amplifier
Current Limits are changed by an operator only when an amplifier is being replaced in the field.
To Change Current Limit:
• Point the arrow cursor to the desired amplifier Current Limits. The UP and DOWN keys
move the arrow cursor. If the desired Current Limits are not on the display, the other limit(s)
may be reached by using the UP and DOWN keys.
• Use the RIGHT key to select the current limits to be changed.
• UP and DOWN keys change the digit presently under the blinking cursor.
• RIGHT and LEFT keys move the cursor horizontally. If the cursor is moved all the way to
the left (the cursor will turn into an arrow), any pending changes will be erased.
• Press the ENTER key to confirm changes to that line.
A1«LO:100
HI:300
PSA:+5.6V
+24.5V*

14
3.2.3.7 REMOTE FORMAT SCREEN
Use the MENU and arrow keys to select the REMOTE FORMAT screen, then press ENTER.
REMOTE FORMAT screen varies with remote type:
IEEE-488 RS422/RS485
These menus are not available to models equipped with the Contact Closure option as the
remote bus interface.
Change Address: (ADDR)
(RS232, RS422, RS485, and IEEE-488 Options Only)
• Use LEFT, RIGHT, UP and DOWN keys to navigate the cursor to the “:” after “ADDR”.
• While the cursor is blinking, the UP and DOWN keys can be used to change the address;
0-30 for IEEE-488, and 64-95 for RS232, RS422 or RS485.
• RIGHT and LEFT keys still move the cursor horizontally, and cancel any pending changes.
• Press ENTER key to confirm changes.
Change Baud Rate: (BAUD)
(RS232, RS422, and RS485 Options Only)
• Use LEFT, RIGHT, UP and DOWN for RS422 and RS485 keys to navigate the cursor to the
“:” after “BAUD”.
• While the cursor is blinking, the UP and DOWN keys can be used to change the baud rate:
from 300, 600, 1200, 2400, 4800, 9600, to 19200.
• RIGHT and LEFT keys still move the cursor horizontally, and cancel any pending changes.
• Press ENTER key to confirm changes.
Change Communications Bus: (BUS)
(RS422 and RS485 Options Only)
• Use LEFT, RIGHT, UP and Down keys to navigate the cursor to the “:” after “BUS”.
• While the cursor is blinking, the UP and DOWN keys can be used to change the bus to
either RS422 (422) or RS485 (485).
• RIGHT and LEFT keys still move the cursor horizontally, and cancel any pending changes.
• Press ENTER key to confirm changes.
BUS: RS232
ADDR:64
BUS: IEEE-488
«ADDR:XX
BUS:232 ADDR:64
«BAUD:9600 P:O
BUS:4XX ADDR:64
«BAUD:9600 P:O

15
Change Parity: (P)
(RS232, RS422 and RS485 Options Only)
• Use LEFT, RIGHT, UP, and DOWN keys to navigate the cursor to the “:” after “P”.
• While the cursor is blinking, the UP and DOWN keys can be used to change the parity to
Odd (O), Even (E), or None (N).
• RIGHT and LEFT keys still move the cursor horizontally, and cancel any pending changes.
• Press ENTER key to confirm changes.
3.2.3.8 ETHERNET PARAMETER SCREENS
Static IP Address
To change the Static IP Address:
• Press the up or down arrow key until the IP Address screen is displayed.
• Press the right or left arrow keys to highlight the IP Address field on the display.
• Use the up and down arrow keys to scroll the numeric values of each digit in the octet.
• Press the right or left arrow key to highlight the next digit field to change.
• Press “ENT” to save the IP Address.
• Press the up or down arrow keys to scroll to the next or the previous display screen.
Dynamic IP Address:
• Press the left or right arrow key to highlight the IP Address field on the display.
• Use the up and down arrow keys to scroll the numeric values entering zero for each digit in
each octet of the IP Address.
• Press “ENT” to accept the choice.
• The display will remain at 000.000.000.000 but the unit will be assigned a Dynamic Address
by the system.
• Press the up or down arrow keys to scroll to the next or the previous display screen.
Gateway
To change the Gateway:
• Press the up or down arrow key until the Gateway screen is displayed.
• Press the right or left arrow keys to highlight an octet of the Gateway.
• Use the up and down arrow keys to scroll the numeric value of the octet.
• Press the right or left arrow keys to select the next octet field to change.
• Press “ENT” to save the Gateway.
• Press the up or down arrow keys to scroll to the next or the previous display screen.
↑IP ADDRESS:
↑IP ADDRESS:
↑GATEWAY:

16
Subnet Mask
To change the Subnet Mask:
• Press the up or down arrow key until the Subnet Mask screen is displayed.
• Press the right or left arrow keys to highlight an octet of the Subnet Mask.
• Use the up and down arrow keys to scroll the numeric value of the octet.
• Press the right or left arrow keys to highlight the next octet field to change.
• Press “ENT” to save the Subnet Mask.
• Press the up or down arrow keys to scroll to the next or the previous display screen.
Password
To change the Password:
• Press the up or down arrow key until the Password screen is displayed.
• Press the right or left arrow keys to highlight the first or last character of the Password.
• Use the up and down arrow keys to scroll through the available characters.
• Press the right or left arrow keys to select the next character field.
• Repeat this process until the desired password is set.
• Press “ENT” to save the Password.
• Press the up or down arrow keys to scroll to the next or the previous display screen.
3.2.3.9 CONTRAST ADJUST SCREEN
Use the MENU and arrow keys to select the CONTRAST ADJ screen, then press ENTER.
Changes to the contrast are accepted without the need for the ENTER key to be pressed.
Change Contrast:
• Press the UP key to darken the display.
• Press the DOWN key to lighten the display.
• ENTER or MENU keys both operate as an escape key to the Main Menu.
CONTRAST ADJUST
UP/DOWN ARROW
↑SUBNET MASK:
↑PASSWORD:
↓
11111

17
3.2.3.10 PRIORITY SCREEN (1:2 Configuration Only)
Use the MENU and arrow keys to select the Priority screen, then press ENTER.
This section is only available to 1:2 models.
Change Priority:
• Press UP and DOWN keys scroll through the selections: A1, A2, and NONE.
• Press ENTER key to confirm changes.
3.2.3.11 DATE/TIME SCREEN
Use the MENU and arrow keys to select the DATE/TIME screen, then press ENTER.
While in the Date/Time screen, the Date and Time will be updated with the present time. While
the changes are pending, and have not been confirmed (by an ENTER key press), the time and
date on the screen will freeze. Canceling the changes pending by either escaping (the MENU
key acts as an escape key) or allowing the screen to time out, will cause the internally kept time
to reappear without being effected by the interruption.
Change the Time or Date:
• Point the arrow cursor to either the Time or Date by using the UP and DOWN keys.
• Use the RIGHT key to select that line.
• UP and DOWN keys change the digit presently under the blinking cursor.
• RIGHT and LEFT keys move the cursor horizontally. If the cursor is moved all the way to
the left (the cursor will turn into an arrow), any pending changes will be erased.
• ENTER key to confirm changes to that line.
«DATE: 1/01/00
TIME: 00:01:23
PRIORITY-
AMPLIFIER: A1

18
3.2.3.12 ALARM MENU
Press the ALARM key to display the Alarm Menu.
The Alarm Menu displays the number of active alarms and the number of events stored in the
Event Log. The Alarm Menu also provides access to the Active Alarm screen and the Event
Log screen.
To View Active Alarms:
If there are no active alarms, then the user will not be able to access the ALARM sub-screen.
• Point the arrow to ”ALARMS” using the UP, DOWN, LEFT, and RIGHT keys.
• Press ENTER key to select. The display will read:
• There is one screen for each active alarm, press the UP and DOWN keys to scroll through
them. If there is only one active alarm, then these keys will not have any function.
• MENU key operates as an escape key and returns you to the ALARM MENU screen.
To View Events:
If there are no events logged, then the user will not be able to access the EVENT sub-screen
The events are ordered chronologically, the most recent event will have the highest number,
and it will be displayed first.
• Point the arrow to ”EVENTS” using the UP, DOWN, LEFT, and RIGHT keys.
• Press ENTER key to select. The display will read:
• There is one screen for each event in the Event Log, press the UP and DOWN keys to scroll
through them. If there is only one event in the log, then these keys will not have any
function.
A
LARM 01 OF 01
A1 Fault
«02 ALARMS
32 EVENTS
«32 OF 32
TIME A1 Fault

19
• To view the time the event was logged, use the LEFT and RIGHT keys to point the arrow
cursor to “TIME”, press the ENTER key, and the display will read:
To go back to the related event, press the MENU key (to escape) or wait five seconds.
• ENTER key selects the TIME of EVENT sub-screen for the event presently displayed.
• MENU key operates as an escape key and returns you to the ALARM MENU screen.
3.2.3.13 REMOTE/LOCAL SCREEN
Use the REMOTE key to display the Remote/Local control mode screen
Change the Remote/Local Status:
• Press UP and DOWN keys to move the cursor to the new control mode.
• Press the ENTER key to confirm.
3.2.3.14 MANUAL/AUTO SCREEN
Use the MANUAL key to display the Redundancy control screen.
Change the Manual/Automatic Status:
• Press the UP / DOWN keys to move the cursor to change the redundancy control mode.
• Press the ENTER key to confirm the change.
«AUTO
MANUAL
«REMOTE
LOCAL
«DATE:
1/01/00

20
SECTION 4
REMOTE OPERATIONS
The equipment is supplied with an RS485/RS422 bus. As an option, the equipment can be
supplied with an IEEE-488, RS232, contact closure or Ethernet interface instead of the
RS485/RS422. The command structures for the serial buses and Telnet are identical.
The IEEE-488 message format is similar to the serial message format. The IEE-488 message
does not require the header, address, trailer or checksum characters included in the structure.
4.1 SERIAL REMOTE PROTOCOL (RS485/RS422/RS232)
The command structures for the serial buses; RS485, RS422 and RS232 are identical. 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 7EH.
Serial data format is a 10 bit sequence consisting of 1 Start, 7 Data, 1 Parity, and 1 Stop bit. If
No Parity is used then the data sequence consists of 1 Start, 8 Data, 0 Parity, and 1 Stop bit. If
any character in a command message contains an error (parity, framing or overrun) or if the
checksum is incorrect, the command is ignored and no response is made. The remote
parameters: Address, Baud Rate, and Parity are programmable from the front panel. The
response time from command to acknowledge is 100 ms. maximum.
All properly formatted serial messages addressed to the equipment are acknowledged with a
response message. The unit continually monitors the communication bus and will accept
commands, addressed to it, even in Local mode. When in Local mode, receipt of any SET
commands will be ignored and the unit will respond with an error code.
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 equipment or
monitor traffic on the communication bus.