Section 3: Operation
Page 3-24
NetClock/GTP Instruction Manual
For cable runs less than 1500 feet, a lower-cost twisted pair cable may be used.
Refer to Table 3-6 for possible sources.
MANUFACTURER
PART NUMBER
Alpha Wire Corporation
1-800-52ALPHA
5471
Belden Wire and Cable Company
1-800-BELDEN-1
9501
Carol Cable Company
606-572-8000
C0600
TABLE 3-6 CABLE SOURCES FOR RS-485 LINES UNDER 1500 FEET
3.4.2 Connection
Method
The RS-485 transmission line must be connected in a daisy chain configuration
as shown in Figure 3-8. In a daisy chain configuration, the transmission line
connects from one RS-485 receiver to the next. The transmission line appears
as one continuous line to the RS-485 driver.
A branched or star configuration is not recommended. This method of
connection appears as stubs to the RS-485 transmission line. Stub lengths
affect the bus impedance and capacitive loading which could result in reflections
and signal distortion.
FIGURE 3-8 ONE-WAY BUS INSTALLATION
