You Are Here:
You are here: APPENDIX > OPTION CARDS > Time & Frequency > 1PPS Out -18 19 21 2B

1PPS Out [1204-18, -19, -21, -2B]

1PPS Output Modules (TTL, 10V, RS-485)

The 1PPS output module provides four additional 1PPS outputs on BNC connectors or terminal block for the SecureSync platform.

Model 1204-18 1PPS Output (TTL): Specifications

  • Outputs: (4) 1PPS output
  • Signal Type and Connector: TTL (BNC)
  • Output Load Impedance: 50 Ω
  • Rise Time to 90% of Level: <10 ns
  • Programmable Pulse Width: 100 ns to 900 ms with 20 ns resolution
  • Absolute Phase Error: ±50 ns (1σ)
  • Programmable Phase Shift: ±5ns to 500 ms with 5ns resolution
  • Maximum Number of Cards: 6
  • Ordering Information: 1204-18 1PPS TTL output module, BNC connector

Model 1204-18 option card rear plate

Model 1204-19 1PPS Output (10 V): Specifications

  • Outputs: (4) 1PPS output
  • Signal Type and Connector: 10 V (BNC)
  • Output Load Impedance: 50 Ω
  • Rise Time to 90% of Level: <30 ns
  • Programmable Pulse Width: 100 ns to 900 ms with 20 ns resolution
  • Absolute Phase Error: ±50 ns (1σ)
  • Programmable Phase Shift: ±5ns to 500 ms with 5ns resolution
  • Maximum Number of Cards: 6
  • Ordering Information: 1204-19 1PPS 10 V output module, BNC connector

Model 1204-19 option card rear plate

 

Model 1204-21 1PPS Output (RS-485): Specifications

  • Inputs/Outputs: (4) 1PPS output
  • Signal Type and Connector: RS-485 (terminal block)
  • Output Load Impedance: 120 Ω
  • Rise Time to 90% of Level: <10 ns
  • Programmable Pulse Width: 100 ns to 900 ms with 20 ns resolution
  • Absolute Phase Error: ±50 ns (1σ)
  • Programmable Phase Shift: ±5ns to 500 ms with 5ns resolution
  • Maximum Number of Cards:6
  • Ordering Information: 1204-21 1PPS RS-485 output module, terminal block

Model 1204-21 option card rear plate

Model 1204-21 terminal block pin assignments

Pin No. Function
1 1PPS Output 1 +
2 1PPS Output 1 -
3 GND
4 1PPS Output 2 +
5 1PPS Output 2 -
6 1PPS Output 3 +
7 1PPS Output 3 -
8 GND
9 1PPS Output 4 +
10 1PPS Output 4 -

Model 1204-2B 1PPS Output (Fiber Optical): Specifications

  • Inputs/Outputs: (4) 1PPS output
  • Operating Wavelength: 820/850 nm
  • Optical Power: -15 dBm average into 50/125 fiber
  • Fiber Optic Compatibility: 50/125 μm, 62.5/125 μm multi-mode cable
  • Optical Connector: ST
  • Programmable Pulse Width: 100 ns to 900 ms with 20 ns resolution
  • Absolute Phase Error: ±50 ns (1σ)
  • Programmable Phase Shift: ±5ns to 500 ms with 5ns resolution
  • Maximum Number of Cards: 6
  • Ordering Information: 1204-12B 1PPS Fiber Optic output module, ST connector

Model 1204-2B option card rear plate

1PPS Output: Edit Window

To configure the settings of a 1PPS Output, go to its Edit window. For instructions, see: Configuring Option Card Inputs/Outputs.

The Web UI list entries for these option cards are:

  • 1PPS OUT, 4-BNC
  • 1PPS OUT, 10 V
  • 1PPS OUT, RS-485
  • 1PPS OUT, Fiber

Note: SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz outputs start at 1, because of the built-in outputs).

The Edit window allows the configuration of the following settings:

  • Signature Control: Used to control when the 1PPS output signal will be present. See Signature Control.
  • Offset: Used to account for 1PPS cable delays or other latencies in the 1PPS output. The Offset value is entered and displayed in nanoseconds (ns). The available Offset range is -500 to +500 ms.
  • Edge: The operator can select if the output signal is a positive (reference on the rising edge) or a negative (reference on the falling edge) pulse.
  • Pulse Width: Configures the Pulse Width of the 1PPS output. The Pulse Width is entered and displayed in nanoseconds (ns). The default Pulse Width is 200 milliseconds.

1PPS Output: Status Window

To view the current settings of a 1PPS Output, go to its Status window. For instructions, see: Viewing Input/Output Configuration Settings.

The Web UI list entries for these option cards are:

  • 1PPS OUT, 4-BNC
  • 1PPS OUT, 10V
  • 1PPS OUT, RS-485
  • 1PPS OUT, Fiber

Note: SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz outputs start at 1, because of the built-in outputs).

The Status window displays the following settings:

  • Signature Control: Displays the current configuration of Signature Control; see Signature Control.
  • Frequency: Indicates the configured frequency of the 1PPS output signal.
  • Offset: Displays the configured Offset (to account for cable delays or other latencies).
  • Edge: Shows if the on-time point of the 1PPS output is the rising or falling edge of the pulse.
  • Pulse Width: Displays the configured Pulse Width of the 1PPS output. The Pulse Width is displayed in nanoseconds (ns). The default Pulse Width is 200 milliseconds.