
Page 2-9
The mating terminal blocks are provided in the equip-
ment ancillary kits.
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: The TimeView 400 accepts only
The TimeView 400 accepts only
The TimeView 400 accepts only
The TimeView 400 accepts only
The TimeView 400 accepts only
Format 0 or Format 1 data
Format 0 or Format 1 data
Format 0 or Format 1 data
Format 0 or Format 1 data
Format 0 or Format 1 data
streams. Configure the RS-485
streams. Configure the RS-485
streams. Configure the RS-485
streams. Configure the RS-485
streams. Configure the RS-485
output port on the NetClock or
output port on the NetClock or
output port on the NetClock or
output port on the NetClock or
output port on the NetClock or
TimeBridge to provide Format 0
TimeBridge to provide Format 0
TimeBridge to provide Format 0
TimeBridge to provide Format 0
TimeBridge to provide Format 0
or Format 1.
or Format 1.
or Format 1.
or Format 1.
or Format 1.
2.4
2.4
2.4
2.4
2.4
INTERCONNECTION INFORMA
INTERCONNECTION INFORMA
INTERCONNECTION INFORMA
INTERCONNECTION INFORMA
INTERCONNECTION INFORMATION
TION
TION
TION
TION
Figures 2-6 and 2-7 illustrate typical RS-485 time data
bus interconnections. Follow the RS-485 guidelines listed
below when constructing the RS-485 time data bus.
2.4.1
2.4.1
2.4.1
2.4.1
2.4.1
RS-485 Guidelines
RS-485 Guidelines
RS-485 Guidelines
RS-485 Guidelines
RS-485 Guidelines
Background
Background
Background
Background
Background
: RS-485 is a balanced differential transmis-
sion that offers exceptional noise immunity and cable
lengths up to 4000 feet using twisted pair cable.
Cable selection
Cable selection
Cable selection
Cable selection
Cable selection
: Low capacitance, shielded twisted pair
cable is recommended in installations where the RS-485
cable length is expected to exceed 1500 feet. Table 2-3
suggests some manufacturers and part numbers
for extended distance cables. These cables are specifi-
cally designed for RS-422 or RS-485 applications; they
have a braided copper shield, nominal impedance of 120
ohms, and a capacitance of 12 to 16 picofarads per foot.
RS-485 cable may be purchased from Spectracom. Specify
part number CW04xxx, where xxx equals the length in
feet.