Pin Signal
11 IRIG AM OUT
12 GND
13 (First signal) RS485 B, inverting
14 (Second signal) RS485 B, inverting
15 RS232 RX IN
Table 1-2:
Multi I/O signal defaults
Pins Channel Default Signal
6 & 7 DCLS OUT IRIG OUT
1 & 2 DCLS IN IRIGIN
15 & 10 RS232 IN ATC IN
5 & 10 RS232 OUT ATC OUT
3, 8, 13 RS485 (1) HAVEQUICK
OUT
4, 9, 14 RS485 (2) HAVEQUICKIN
11 & 12 IRIG AM OUT IRIGOUT(AM
ONLY)
1.3.4 DCLS Output
The rear panel DCLS OUT BNC female connector defaults to a 1PPS Output (see below),
but can be configured to produce different output signals: IRIG Output, HaveQuick Output,
and GPIOOutput.
1.3.4.1 1PPS Output
Signal: One pulse-per-second square wave (ext. reference connected to GNSS receiver)
Signal level: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω
Pulse width: Configurable pulse width (200 ms by default)
Pulse width range: 20 ns to 900 ms
Rise time: <10 ns
Accuracy: Positive edge within ±50 ns of UTC when locked to a valid, traceable input ref-
erence
Connector: BNC female
10
SecureSync 2400 Getting Started Guide Rev. 2
1.3 Interfaces
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