evertz 1200 Series User manual

1200 Series
Analog Clock Displays
Instruction Manual
© Copyright 2002 - 2007
EVERTZ MICROSYSTEMS LTD.
5288 John Lucas Drive,
Burlington, Ontario, Canada,
L7L 5Z9
Phone: [phone]
Sales Fax: [phone]
Support Fax: [phone]
Internet: Sales: [email protected]
Tech Support: [email protected]
Web Page: http://www.evertz.com
Version 1.1 July 2007
The material contained in this manual consists of information that is the property of Evertz Microsystems and is
intended solely for the use of purchasers of the 1200 Series Analog Clock Displays. Evertz Microsystems
expressly prohibits the use of this manual for any purpose other than the operation of the device.
All rights reserved. No part of this publication may be reproduced without the express written permission of
Evertz Microsystems Ltd. Copies of this guide can be ordered from your Evertz products dealer or from Evertz
Microsystems.

INFORMATION TO USERS IN EUROPE
NOTE
CISPR 22 CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to the European Union EMC directive. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation
of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.
INFORMATION TO USERS IN THE U.S.A.
NOTE
FCC CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
WARNING
Changes or Modifications not expressly approved by Evertz Microsystems Ltd. could
void the user’s authority to operate the equipment.
Use of unshielded plugs or cables may cause radiation interference. Properly shielded
interface cables with the shield connected to the chassis ground of the device must be
used.

1200 Series Analog Clock Displays Manual
1200 Revision 1.1
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Original Release Jul 02
1.1 Fixed formatting and typos Jul 07
Information contained in this manual is believed to be accurate and reliable. However, Evertz assumes no responsibility for the use thereof nor
for the rights of third parties, which may be effected in any way by the use thereof. Any representations in this document concerning
performance of Evertz products are for informational use only and are not warranties of future performance, either express or implied. The only
warranty offered by Evertz in relation to this product is the Evertz standard limited warranty, stated in the sales contract or order confirmation
form.
Although every attempt has been made to accurately describe the features, installation and operation of this product in this manual, no
warranty is granted nor liability assumed in relation to any errors or omissions unless specifically undertaken in the Evertz sales contract or
order confirmation. Information contained in this manual is periodically updated and changes will be incorporated into subsequent editions. If
you encounter an error, please notify Evertz Customer Service department. Evertz reserves the right, without notice or liability, to make
changes in equipment design or specifications.

1200AC Analog Clock Manual
Revision 1.1 1200
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1200 Series Analog Clock Displays Manual
1200 Revision 1.1
TABLE OF CONTENTS
1. OVERVIEW.......................................................................................................................... 1
2. INSTALLATION................................................................................................................... 3
2.1. TIMECODE INPUTS AND OUTPUTS.......................................................................................4
2.2. RS-232 COMMUNICATIONS PORT .........................................................................................4
2.3. POWER .....................................................................................................................................4
2.4. MOUNTING................................................................................................................................5
3. SPECIFICATIONS ...............................................................................................................6
3.1. LTC INPUT ................................................................................................................................6
3.2. LTC OUTPUT ............................................................................................................................6
3.3. TIME KEEPING .........................................................................................................................6
3.4. BACKUP BATTERY..................................................................................................................6
3.5. ELECTRICAL ............................................................................................................................6
3.6. PHYSICAL.................................................................................................................................7
4. STATUS LED....................................................................................................................... 8
5. REAR PANEL CONTROLS................................................................................................. 9
5.1. SETTING THE TIME ZONE OFFSET........................................................................................9
5.2. SETTING THE DEFAULT TIME CODE FRAME RATE..........................................................11
5.3. SETTING THE SECOND HAND MODE..................................................................................11
5.4. SETTING TIME MANUALLY...................................................................................................11
6. JUMPERS AND BATTERY REPLACEMENT ................................................................... 12
6.1. REMOVING THE BACK COVER:...........................................................................................12
6.2. REPLACING THE BACK COVER: .........................................................................................12
6.3. CHANGING THE BATTERY:..................................................................................................12
6.4. SELECTING MASTER/SLAVE MODE: ..................................................................................12

1200AC Analog Clock Manual
Revision 1.1 1200
7. SOFTWARE CONTROL.....................................................................................................15
7.1. CONNECTING THE CLOCK TO A COMPUTER....................................................................15
7.1.1. Requirements.....................................................................................................................15
7.1.2. Connecting the COM Port..................................................................................................15
7.1.3. Terminal Program Setup....................................................................................................15
7.2. COMMAND DESCRIPTIONS..................................................................................................15
7.2.1. Parameters.........................................................................................................................16
7.2.2. System Overview. ..............................................................................................................17
7.2.3. Assigning A Clock To A Specific Group.............................................................................17
7.2.4. Sending A Message To Specific Downstream Clocks.......................................................17
7.2.5. Sending A Message To a Group of Downstream Clocks...................................................17
7.2.6. Reading Register Values From A Clock.............................................................................18
7.2.7. Setting the Clock time........................................................................................................18
7.2.8. Setting the Time Zone Offset.............................................................................................19
7.2.9. Setting the Clock Date .......................................................................................................19
7.2.10. Automatic Daylight Saving Mode .......................................................................................19
7.2.10.1.Enabling Automatic Daylight Saving Adjust Mode...............................................20
7.2.10.2.Disabling Automatic Daylight Saving Adjust Mode..............................................20
7.2.10.3.Setting the Daylight Saving Time Offset Value....................................................20
7.2.10.4.Setting the Daylight Saving Time Date Mode......................................................20
7.2.10.5.Setting the Daylight Saving Time Start and Stop Hour........................................20
7.2.10.6.Setting the Daylight Saving Time Dates – Week Mode.......................................21
7.2.10.7.Setting the Daylight Saving Time Dates – Month Mode......................................21
Figures
Figure 1-1: Clock Block Diagram ........................................................................................................................ 2
Figure 2-1: Rear Panel Overview........................................................................................................................ 3
Figure 2-2: Rear Panel Connections and Controls............................................................................................. 3
Figure 2-3: Rear Panel Mounting Template........................................................................................................ 5
Figure 6-1: Master/Slave Mode Schematic....................................................................................................... 13
Figure 6-2: Setting the Clock to Master Mode .................................................................................................. 14
Figure 6-3: Setting the Clock to Slave Mode..................................................................................................... 14
Tables
Table 2-1: COM Port Pinout................................................................................................................................ 4
Table 5-1: DIP Switch Functions Overview......................................................................................................... 9
Table 5-2: Time Zone Offset Switch Settings.................................................................................................... 10
Table 5-3: Default Time Code Rate DIP Switch Functions............................................................................... 11
Table 5-4: Second Hand Mode DIP Switch Functions...................................................................................... 11
Table 6-1: Comparison of Master and Slave Modes......................................................................................... 13
Table 7-1: Read Back Commands.................................................................................................................... 18
Table 7-2: DST Register Default Values........................................................................................................... 19

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 1
1. OVERVIEW
The 1200 Series Analog Clock Displays take master and slave clock technology to new levels of
convenience and excellence. The clocks are microprocessor controlled and employ separate direct drive
motors for each hand. This means that, as well as being able to set the time almost instantaneously, the
new displays are also silent in operation. The hands of the clocks can be programmed to move in sweep
mode or in steps.
Each clock can be programmed for automatic Daylight Saving Time adjustment, as well as for any time
zone offset using a laptop computer. It is then only necessary to supply the clock system with Universal
Coordinated Time (UTC) from the master clock. Daylight Saving Time changes will be automatic, as will
adjustments for different time zones.
Each clock can be used as a master or slave clock. When used as a slave clock, it reads SMPTE/EBU
linear timecode (LTC) from a master clock. When used as a master, it generates LTC for distribution to
other slave clocks. In fact, any clock in the chain can generate timecode as soon as it looses timecode
input from the master. The system is therefore extremely robust and reliable.
The problems of power distribution have also been considerably simplified. With other clock products, it is
necessary to install power outlets wherever clocks are to be located. The Evertz system slave clocks are
powered from a single feed that distributes both power and modulated timecode. The power is introduced
at one of the 1200 series clocks running in Master mode and from there it is distributed to the other
downstream clocks running in slave mode. If the system is large, power can be introduced at multiple
convenient clock locations.
Internal crystal oscillators ensure that the clocks will continue to operate in the absence of input timecode.
Internal battery backup ensures that each clock will continue to keep time in the absence of timecode and
power. When power resumes, the hands will immediately reset to the correct time.
The 1200 series clock displays are offered in two sizes. Backlighting is available for all models.
Model Description
1212 12” diameter clock display
1212L 12” diameter clock display with back lighting
1216 16” diameter clock display
1216L 16” diameter clock display with back lighting
Throughout this manual the model 1200 will be used to describe the clocks when describing common
features. When necessary, the specific model numbers will be used to distinguish features only available
on some models.
Features:
• Automatic detection of 30 Fps or 25 Fps SMPTE/EBU timecode input
• Three motors for quiet operation and rapid hand setting - sets to time in 10 seconds
• Automatic Daylight Saving Time adjustment
• Addressable slave clocks with programmable time offsets of 0 to 23.5 hours in 0.5 hour increments -
set via DIP switches or RS-232 control
• Accepts date information from LTC User Bits using SMPTE 309M or Leitch™ protocol
• Master or Slave operation with battery backed up clock
• Single cable distribution for both power and timecode

1200 Series Analog Clock Displays Manual
1200 - 2 Revision 1.1
• In master mode, outputs 12 VDC modulated with timecode
• In slave mode, can operate off 12VDC modulated with timecode. This allows multiple clocks to run off
a single 110/220 AC power outlet
• Sweep or Step second hand movement
• Optional back lighting of clock face
• Two sizes 12” or 16”
• Time may be set manually via pushbutton switches, or through the RS-232 serial port
LTC I/O CPU
Battery
backed up
real time
clock
RS-232
12 1
2
3
4
5
6
7
8
9
10
11
Motors and Display
Power
Figure 1-1: Clock Block Diagram

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 3
2. INSTALLATION
The 1200 series clocks have keyhole slots for mounting. They have a 4 pin connector for timecode input
and output. They have a power jack for 12 VDC input and there is a 12 VDC adapter supplied which is
installed in a slot in the rear panel. This allows the clock to run on 12 VDC, 110/220 VAC or to receive
power from another upstream 1200 series clock operating in master mode. There is a DB-9 connector for
RS-232 communications from a PC.
12VDC Input
Mounting
holes Toggle
Pushbutton
DIP switches
COM
Adapter
LTC I/O
Figure 2-1: Rear Panel Overview
Figure 2-2: Rear Panel Connections and Controls

1200 Series Analog Clock Displays Manual
1200 - 4 Revision 1.1
2.1. TIMECODE INPUTS AND OUTPUTS
There is a terminal block at the rear of the clock that can contain the time code inputs and outputs.
IN+, IN- These two input pins are for connecting SMPTE/EBU linear timecode (LTC) to the clock.
OUT+, OUT- These two output pins are for connecting LTC and 12VDC to other clocks.
In slave mode these pins are looped through from the respective input pins. In master
mode these pins contain a reclocked copy of the input LTC modulated on 12VDC. See
section 6.4 for information on selecting Master or Slave mode.
!
Time code output pins may contain 12 VDC. Do not connect the time code
outputs to anything other than another 1200 series clock operating in slave mode,
or damage may occur to the other device.
2.2. RS-232 COMMUNICATIONS PORT
The COM connector is a female 9 pin D connector used for connecting a computer to control the 1200
series clocks. This port is wired at the factory as an RS232 DCE port as shown in Table 2-1 and can be
connected directly to most PC COM ports using a ‘straight through’ cable. The RS-232 communication is
2400 baud, 8 bits, no parity, 1 stop bit, no flow control. See section 7 for information on controlling the
clock using the serial port.
Pin # Name Description
1 Not connected
2 TxD RS-232 Transmit Output
3 RxD RS-232 Receive Input
4 Not connected
5 Sig Gnd RS-232 Signal Ground
6 Not connected
7 Not connected
8 Not connected
9 Not connected
Table 2-1: COM Port Pinout
2.3. POWER
The 1200 series clocks come with an auto-ranging DC voltage adapter that automatically
senses the input voltage. This power adapter should be used when the clock is operating in
Master mode. Power should be applied by connecting a 3-wire grounding type power supply
cord to the power entry module on the DC voltage adapter. The power cord should be
minimum 18 AWG wire size; type SST marked VW-1, maximum 2.5 m in length. The DC cable
of the voltage adapter should be connected to the DC power jack on the rear panel.
When the clock is operating in Slave mode, it receives power from upstream 1200 series
clocks. See section 6.4 for information on selecting Master or Slave mode.

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 5
2.4. MOUNTING
The 1200 series clocks are designed to be surface mounted on a wall using two screws in the keyhole
slots provided. The rear panel drawing shown in Figure 2-3 shows the location of the keyhole slots for the
1212 and 1216 clocks.
3 in.
3 3/8 in.
3 in.
12 Clock Mounting Dimensions
1216 Clock Mounting Dimensions
5 in.5 in.
1212 Clock Outline
1216 Clock Outline
5 3/8 in.
13 in.
13 in.
17 in.
17 in.
C/L
Figure 2-3: Rear Panel Mounting Template

1200 Series Analog Clock Displays Manual
1200 - 6 Revision 1.1
3. SPECIFICATIONS
3.1. LTC INPUT
Standard: SMPTE 12M linear time code - 25 or 30 Fps nominal.
Connector: Phoenix 4 pin terminal connector.
Signal Level: 1 Vp-p nominal.
Input impedance: > 30K Ohm
3.2. LTC OUTPUT
Standard:
Slave Mode: Same as input.
Master Mode: Same as input
Set by DIP switch when input not present - 25 Fps or Non drop-frame 30 Fps.
Connector: Phoenix 4 pin terminal connector.
Signal Level:
Slave Mode: looped through from input
Master Mode: 1 Vp-p nominal with 11.5VDC nominal offset to drive downstream slave clocks.
3.3. TIME KEEPING
Accuracy: < 2 seconds per day with power on, no timecode present.
< 10 seconds / day with power removed.
Time Zone Offset: 0 to 23½ hours in ½ hour increments
Set with DIP switches or serial port command.
3.4. BACKUP BATTERY
Type: CR-2032 3 volt lithium cell.
Life expectancy: > 5 years
3.5. ELECTRICAL
Voltage: Auto ranging 100-240 VAC 50/60 Hz with adapter or
12 VDC from upstream powered clocks
Power:
Standard: 1.33 Watts (plus power for downstream slave clocks)
Backlit models: 3.00 Watts (plus power for downstream slave clocks)

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 7
3.6. PHYSICAL
Outside Dimensions:
1212, 1212L: 13" W x 13" H x 2.5" D
(330 mm W x 330 mm H x 64 mm D)
1216, 1216L: 17" W x 17" H x 2.5" D
(432 mm W x 432 mm H x 64 mm D)
Clock Face:
1212, 1212L: 12” diameter
1216, 1216L: 16” diameter
Weight:
1212, 1212L: 6.5 lb (2.9 Kg)
1216, 1216L: 10.5 lb (4.75 Kg)

1200 Series Analog Clock Displays Manual
1200 - 8 Revision 1.1
4. STATUS LED
The 1200 series clocks are fitted with a red status LED located at the bottom of the front face of the clock,
just below the number “6”. The LED has three modes:
OFF: The clock is running normally and has input LTC.
ON: The clock is running normally but has no LTC input.
FLASHING: The clock is in manual time setting mode.

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 9
5. REAR PANEL CONTROLS
The 1200 series clocks are equipped with a three position, return to center toggle switch that is used in
conjunction with a momentary pushbutton to set the clock time (see section 5.4). An 8 position DIP switch
allows the user to select various functions. DIP switch 1 is located at the right of the DIP switch, and the
On position is Up. Table 5-1 gives an overview of the DIP switch functions. Sections 5.1 to 5.3 describe
the DIP switch functions in more detail.
DIP Switch Function
1
2
3
4
5
6
Sets Time zone Offset
7 Sets Time Code mode when no input
8 Sets Second Hand mode
Table 5-1: DIP Switch Functions Overview
5.1. SETTING THE TIME ZONE OFFSET
DIP switches 1 to 6 are used to set the time zone offset for the clock. The Time zone offsets can be set
from 0 to 23.5 hours in one half our intervals and will be added to the LTC time being received. Table 5-2
shows the settings for the various time zones. When the switches are all in the On position the time zone
must be set by software control (see section 7.2.8 for more information).

1200 Series Analog Clock Displays Manual
1200 - 10 Revision 1.1
6 5 4 3 2 1 Time Offset Time Zone Code (Hex)
Off Off Off Off Off Off + 0 hours 0x00
Off Off Off Off Off On + ½ hours 0x01
Off Off Off Off On Off + 1 hours 0x02
Off Off Off Off On On + 1½ hours 0x03
Off Off Off On Off Off + 2 hours 0x04
Off Off Off On Off On + 2½ hours 0x05
Off Off Off On On Off + 3 hours 0x06
Off Off Off On On On + 3½ hours 0x07
Off Off On Off Off Off + 4 hours 0x08
Off Off On Off Off On + 4½ hours 0x09
Off Off On Off On Off + 5 hours 0x0A
Off Off On Off On On + 5½ hours 0X0B
Off Off On On Off Off + 6 hours 0X0C
Off Off On On Off On + 6½ hours 0X0D
Off Off On On On Off + 7 hours 0X0E
Off Off On On On On + 7½ hours 0X0F
Off On Off Off Off Off + 8 hours 0x10
Off On Off Off Off On + 8½ hours 0x11
Off On Off Off On Off + 9 hours 0x12
Off On Off Off On On + 9½ hours 0x13
Off On Off On Off Off + 10 hours 0x14
Off On Off On Off On + 10½ hours 0x15
Off On Off On On Off + 11 hours 0x16
Off On Off On On On + 11½ hours 0x17
Off On On Off Off Off + 12 hours 0x18
Off On On Off Off On + 12½ hours 0x19
Off On On Off On Off + 13 hours 0x1A
Off On On Off On On + 13½ hours 0X1B
Off On On On Off Off + 14 hours 0X1C
Off On On On Off On + 14½ hours 0X1D
Off On On On On Off + 15 hours 0X1E
Off On On On On On + 15½ hours 0X1F
On Off Off Off Off Off + 16 hours 0x20
On Off Off Off Off On + 16½ hours 0x21
On Off Off Off On Off + 17 hours 0x22
On Off Off Off On On + 17½ hours 0x23
On Off Off On Off Off + 18 hours 0x24
On Off Off On Off On + 18½ hours 0x25
On Off Off On On Off + 19 hours 0x26
On Off Off On On On + 19½ hours 0x27
On Off On Off Off Off + 20 hours 0x28
On Off On Off Off On + 20½ hours 0x29
On Off On Off On Off + 21 hours 0x2A
On Off On Off On On + 21½ hours 0X2B
On Off On On Off Off + 22 hours 0X2C
On Off On On Off On + 22½ hours 0X2D
On Off On On On Off + 23 hours 0X2E
On Off On On On On + 23½ hours 0X2F
On On On On On On Software control 0X3F
Table 5-2: Time Zone Offset Switch Settings

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 11
5.2. SETTING THE DEFAULT TIME CODE FRAME RATE
DIP switch 7 is used to set the default rate of the time code output when there has been no timecode input
to the clock since it was powered up. If a time code input has been detected, the output time code rate will
be set to match the rate of the input code.
DIP 7 FUNCTION
Off
(default) Set Time Code rate to 30 Fps
On Set Time Code rate to 25 Fps
Table 5-3: Default Time Code Rate DIP Switch Functions
5.3. SETTING THE SECOND HAND MODE
DIP switch 8 is used to set the second hand mode:
DIP 7 FUNCTION
Off
(default) Set the second hand to Step mode. The second hand will advance and then stop once per second.
On Set the second hand to Sweep mode. The second hand will move
continuously.
Table 5-4: Second Hand Mode DIP Switch Functions
5.4. SETTING TIME MANUALLY
The 1200 series clocks are equipped with a three position, return to center, toggle switch that is used in
conjunction with a momentary pushbutton to manually set the time.
To set the time, press the HMS pushbutton once. The LED on the front panel will flash, and the hour hand
will wiggle once. Press the toggle switch in the UP or DN position to set the hour hand to the correct time.
If you are finished setting time, do not perform any further action. In 60 seconds, the clock will exit the
time setting mode and the LED will stop flashing.
To set the minutes press the HMS pushbutton again, and the minute hand will wiggle. Press the toggle
switch in the UP or DN position to set the minute hand to the correct time. If you are finished setting time,
do not perform any further action. In 60 seconds, the clock will exit the time setting mode and the LED will
stop flashing.
To set the seconds press the HMS pushbutton again, and the second hand will wiggle and stop. Press
the toggle switch in the UP or DN position to set the second hand to the correct time. Press the HMS
pushbutton again to restart the second hand. Note that you can set the second hand to a future time, and
wait for that time to occur. Pressing the HMS pushbutton will then restart the second hand at the correct
time.

1200 Series Analog Clock Displays Manual
1200 - 12 Revision 1.1
6. JUMPERS AND BATTERY REPLACEMENT
In order to set the MASTER/Slave mode jumpers or replace the lithium battery you will need to remove the
back cover of the clock using the procedure outlined in sections 6.1 and 6.2
6.1. REMOVING THE BACK COVER:
1. Unplug the power cord.
2. Unplug the LTC input/output connector.
3. Unplug the RS-232 connector.
4. Unplug the power adapter from the 12 VDC input.
5. On the 1216 and 1216L clocks, remove 4 small black screws from the outside edges of the clock.
6. Remove 4 screws from the corners of the back panel.
7. Slide the back panel downwards about 1 cm / 3/8 inch, while lifting the bottom edge slightly.
8. When the 12 VDC power jack is clear of the rear panel, lift the rear panel off of the clock. Be
careful not to damage the cable running from the rear panel DB-9 to the circuit board.
9. Remove the ribbon connector from the COM connector to the circuit board.
6.2. REPLACING THE BACK COVER:
1. Replace the cable from the COM connector to the circuit board. Note that the cable runs toward
the black motor chassis.
2. Place the rear cover over the clock.
3. Insert the top of the rear panel in the clock with it in place about 1 cm / 3/8 inch downwards.
4. Place the bottom of the rear panel in the clock. Be careful to not damage the 12 VDC power
jack.
5. Slide the rear panel into position while lifting the bottom edge of the rear panel slightly.
6. On the 1216 and 1216L clocks replace the 4 small black screws around the outside edges of the
clock.
7. Replace 4 screws around the corners of the rear panel.
8. Replace any connectors removed during removal of the back cover.
6.3. CHANGING THE BATTERY:
1. Remove the back cover of the clock as described in section 6.1.
2. The battery is located in a socket on the main circuit board.
3. Carefully remove battery.
4. Replace with a new CR-2032 or equivalent 3 volt lithium cell. Note that the + is up on the
battery.
5. Replace the back cover of the clock as described in section 6.2.
6.4. SELECTING MASTER/SLAVE MODE:
There are 4 jumpers located inside the clock that must be changed to select whether the clock will operate
in Master or Slave mode. Table 6-1 shows a comparison of Master and Slave modes for the clock. Figure
6-1 gives an overview of the schematic for the Master/Slave Jumpers.

1200 Series Analog Clock Displays Manual
Revision 1.1 1200 - 13
Feature Master Mode Slave Mode
Clock Power External power Adapter Upstream Clocks
LTC Input Input to LTC Reader Input to LTC Reader with 12VDC
to power clock
LTC Output Regenerated LTC, Slaved to LTC
Input or clock time, with 12 VDC
to power downstream clocks
Passive loop-through of LTC
input
Table 6-1: Comparison of Master and Slave Modes
LTC Buffer
&
Power Driver
Power
Receiver
LTC Buffer
&
Power Driver
Clock Power
+12 VDC
To
LTC Input B
circuit
To
LTC Input A
circuit
From
LTC Output A
circuit
From
LTC Output B
circuit
MasterSlave
LTC + Input
LTC - Input
LTC - Output
LTC + Output
Figure 6-1: Master/Slave Mode Schematic
Use the following procedure to change the mode of the clock:
1. Remove the back cover of the clock as described in section 6.1.
2. Remove 4 jumpers.
3. Replace 4 jumpers in master or slave position as shown in Figure 6-2 or Figure 6-3.
4. Replace the back cover of the clock as described in section 6.2.

1200 Series Analog Clock Displays Manual
1200 - 14 Revision 1.1
!
Note that all jumpers must all be in slave mode or master mode. They must not
have some in slave, and some in master mode.
Figure 6-2: Setting the Clock to Master Mode
Figure 6-3: Setting the Clock to Slave Mode