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LTRx-512 User’s Guide 

Welcome  

 
Thank you for purchasing your new MASTER CLOCK.

 You can use your new Master to 

ring bells or turn on circuits for up to 99 seconds, as well as to synchronize the time on 
secondary wall clocks or devices. This manual covers 3 models of MASTER clocks: the 

LTR4-512

, the 

LTR8-512

 and the 

LTR8-512M

 

 

 

LTR4-512 LTR8-512 

LTR8-512M 

System Clock 
Correction 

1 correction type running, 
plus RS485 correction 

Up to 2 like or dissimilar 
correction types running 
simultaneously, plus RS485 
correction 

Up to 2 like or dissimilar 
correction types running 
simultaneously, plus RS485 
correction 

Bell Circuits 

4 with no clock correction 
2 with 1 clock correction 

8 with no clock correction 
6 with 1 clock correction 
4 with 2 clock correction  

8 with no clock correction 
6 with 1 clock correction 
4 with 2 clock correction  

Certifications 

UL, cUL,  
 

UL, cUL,  
FCC, DOC (internal modem) 

UL, cUL,  
FCC, DOC (internal modem) 

PC Interface Software 

None 

RS-232, RS-485 
 

RS-232, RS-485,  
Modem  

Atomic clock 
synchronization 

No 

No 

Yes. Requires the 
MasterLink software 

Remote Schedule 
selector switch 
(optional) 

No Yes  Yes 

 

If your Master has 4 lights on the front panel, then you have the model LTR4-512 

CLK 1

1

2

3

4

cancel

ent er

1

2

3

4

5

6

7

8

9

0

*

#

 
If your Master has 8 lights at the left of the front panel, then you have the model LTR8-512. If 
the TR light at the keypad is lit, then you have the model LTR8-512M

 

SD

TR

RD

CD

CLK 2

CLK 1

1

2

3

4

5

6

7

8

cancel

ent er

1

2

3

4

5

6

7

8

9

0

*

#

 

Summary of Contents for LTR4-512

Page 1: ...LTR4 512 LTR8 512 LTR8 512M MASTER CLOCK User s Guide...

Page 2: ...no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the eq...

Page 3: ...r Display 7 Program Keys 7 0 Password 7 1 Set Date and Time 8 2 Select Clock Control 9 3 Manual Bell Control 10 4 Program Schedules 10 5 Schedule Changes 13 6 Enable or Disable Circuits 13 7 Daylight...

Page 4: ...correction 2 with 1 clock correction 8 with no clock correction 6 with 1 clock correction 4 with 2 clock correction 8 with no clock correction 6 with 1 clock correction 4 with 2 clock correction Certi...

Page 5: ...maintenance Daylight savings time features Instant bell schedule changes Instant clock synchronization Holiday schedules Communications when using the LTR MasterLink software with your Master an RS 4...

Page 6: ...play Description V1 06 Firmware version ID Terminal ID BAUD Baud rate for network communications TIME Shows if display is in 12 hr or 24 hr format DST Daylight savings time country code CLK1 CLK2 Cloc...

Page 7: ...a user password and advanced functions require an administrator password 0 Password You must enter a password to use most programming functions To enter your password press 0 PASSWORD 000000 Enter you...

Page 8: ...if you press 5 the display shows ENT DATE 04 03 2003 TODAY IS THURSDAY ENTER TIME HH MM SELECT 0 PM 1 AM Press to confirm or to try again Once you press enter the time of the next upcoming minute usi...

Page 9: ...t Clock Control This function requires the administrator password Use this function to choose the make model of the clocks that your Master will synchronize Note The LTR4 512 can only synchronize one...

Page 10: ...er circuits or press to quit Note When your CLOCK1 Type is Type 14 Electronic Coded or Type 15 Straight Frequency you may need to hold the key for about a minute to energize your bell circuits You wil...

Page 11: ...choose 2 DATA SCAN you can view events You can use these scan keys Scan Key Description 9 1ST Go to the 1st event in ascending time order 3 PRV View the previous event NXT View the next event EXIT End...

Page 12: ...12 hour or 24 hour format If you enter a time earlier than 13 00 1 00 PM then press 1 to change PM to AM ACTIVE DAYS M W F SELECT CKTS 1234 ENTER START HH MM P The menu will ask for the bell length SE...

Page 13: ...er you enter each change the menu gives you the chance to enter scan or edit another one Or press to quit The Master will hold up to 16 programmed changes Once your change occurs your Master clears it...

Page 14: ...1 large schedule of up to 192 events Press 1 8 to select the schedules you wish activated immediately The 0 key turns all schedules off When the ACTIVE NEW line shows the schedules that you want activ...

Page 15: ...Master Clock to catch up If your clocks are impulse types then you will see Enter the time shown on the secondary clocks that have lost time then press You will see PRESS TO EXECUTE To sync the secon...

Page 16: ...ATA EDIT If you choose 1 you will see Use keys 1 9 to enter a holiday in MM DD YY format then press to accept or to cancel HOLIDAY PROGRAMMING SELECTION MODE ENTRY SELECT DATE The menu will now ask fo...

Page 17: ...u should keep a copy of this password in a safe place You cannot choose function C directly To start the Change Password function enter your current password then press 9 0 0 0 NEW PASSWORD 000000 To...

Page 18: ...s equipment may not be used on public coin service provided by the Telephone Company Connection to party lines is subject to state tariffs Contact your state public utility commission or corporation c...

Page 19: ...lly insured with shipping charges prepaid Lathem will not assume any responsibility for any loss or damage incurred in shipping 6 WARRANTY DISCLAIMER AND LIMITATION OF LIABILITY Except only the limite...

Page 20: ...sable Circuits 13 Function 7 Daylight Savings 13 Function 8 Change Schedule 14 Function 9 Sync Clocks 14 Function A Program Holidays 15 Function B Communications 16 Function C Change Password 17 H Hol...

Page 21: ...DUR SS REC No DAYS SMSTWTFSH CIRCUITS 12345678 START HH MM DUR SS Ex MTWTF 1234 08 00 5 Ex MTWTF 1234 08 00 5 01 33 02 34 03 35 04 36 05 37 06 38 07 39 08 40 09 41 10 42 11 43 12 44 13 45 14 46 15 47...

Page 22: ...OGRAMMING CHART DATE ____ ____ ____ REC DATE TIME SCHEDULES NO MM DD YY HH MM 12345678 COMMENTS Ex 06 02 03 07 00 2345 Shortened Schedule 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 COPY THIS PAGE...

Page 23: ...s Guide HOLIDAYS SETUP CHART DATE ____ ____ ____ RECORD DATE NO MM DD YY COMMENTS Ex 07 04 03 Independence Day 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 COPY THIS PAGE TO USE IN CREATING YOUR H...

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