Welcome, Ltr4-512, Ltr8-512 – Lathem LTR8-512 User Manual
Page 4: Ltr8-512m, Elcome, Ltrx-512 user’s guide
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
*
#
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