90 Technical Specifications and Operating Parameters
A.3.5 Event Input, Option 98 – Main Board
• This input has a 100-ns timing resolution, and may be configured to record up to 400 sequen-
tial events, provided that the events are separated by at least 11 ms. The event log may be
read later from the front panel or RS-232 interface. A command is also provided to clear the
event log. Event data is stored in battery-backed RAM.
• The Event A input may also be configured to accept an external 1-PPS signal, and measure
the deviation from a 1-PPS GPS signal with 100-ns resolution.
A.3.6 Synchronization
• For a received data message, the leading edge of the start bit may be selected to trigger the
Event-A input, providing synchronization with 100-ns resolution.
A.4 System Interface
A.4.1 RS-232C Port
For a list of serial port pins and assigned functions, see Table 10.10.
• Connector: 9-pin D-type subminiature:
• RS-422/485 (Option 94): Transmit only.
• Communication Parameters – Selectable 1,200-19,200 baud; 7 or 8 data bits, 1 or 2 stop bits,
odd/even/no parity.
• Supports all keyboard functions.
A.4.2 Broadcast Data Formats
For detailed information on all broadcast formats, please see Section 10.2.3.
A.5 Antenna System
The included antenna is directly mounted on a 26-mm pole (1.05-in. OD or 3/4-in. ID pipe), with
either a standard 1-in. – 14 (approximately M25.4 x 1.81) marine-mount thread or a 3/4-in. NPT
pipe thread. Other mounting configurations are available (contact Arbiter Systems).
• GPS Antenna Assembly, 3/4” Pipe Thread Mount, 35 dB gain; Operates on 5 VDC.
• Optional Antenna Mounting Bracket available to mount on 60-mm (2-in. nominal) pipe (P/N
AS0044600, see section 4.1.2).
A.5.1 Antenna Cable
• 15-meter (50-foot) cable included with antenna.
• Other cable styles and lengths available see Table 4.2 under Available Antenna Cables and
Accessories for Longer Runs.
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