Spectracom Corporation
Model 9289
NetClock/NTP Network Time Provider Instruction Manual
2-11
PORT 1
PORT 2
RS-485 REMOTE
+ - G
+ - G
2.7.2 RS-485 Remote Port
The NetClock has a remote connection labeled “RS-485 PORT 1” (an additional port labeled
“RS-485 PORT 2” is present if Option 02 is purchased). These outputs provide a continuous
once-per-second time data stream in the selected Data Format. Two input time Data Formats,
five output time Data Format selections, and one position data stream in NMEA 0183 format are
available. Refer to Section 6 for a complete description of the Data Format structures.
In addition to Data Formats, baud rate and UTC time difference of each output is selectable.
A 3-position terminal block is supplied in the ancillary kit for each of the Remote Connections.
Also included in the ancillary kit is a jeweler’s type screwdriver to tighten the screws. Connector
pin assignments are shown in Figure 2-6.
Figure 2-6: Remote Outputs (Option 02 Purchased)
RS-485 is a balanced differential transmission requiring twisted pair cabling.
RS-485 characteristics make it ideal to distribute time data throughout a facility. Each Remote
Output can provide time to 32 devices at cable lengths up to 4,000 feet. Refer to the RS-485
Output diagram for a schematic representation of each RS-485 output driver. Relative to RS-
485 specifications, the A terminal (Pin 2) is negative with respect to the B terminal (Pin 1) for a
mark or binary 1. The A terminal is positive to the B terminal for a space or binary 0.
Figure 2-7: RS-485 Output
1
2
3
B Terminal (+)
A Terminal (-)
B
A
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