2.6.1.1 Signal Types
The table below shows the maximum number of available interfaces for each signal type. Note
that you can assign only one signal for each pin pair, hence only four to nine input and output
signals can be transmitted/received at any given time. For details, see the signal mapping table
below.
Table 2-2:
Available signal types
DCLS, TTL DCLS, 10V RS485 RS 485, 120 Ω RS232
PPS out (5), in (2) out (1), in (1) out (4), in (4) in (4)
IRIG out (5), in (2) out (1), in (1) out (4), in (4) in (4)
HQ out (5), in (2) out (1), in (1) out (4), in (4) in (4)
GPIO out (5) out (1)
ASCII out (4), in (4) in (4) out (3), in (3)
Note: ASCII Time Code is abbreviated in the UI as ATC.
DCLS Signal Lines
Up to six TTL (5V) or 10V DCLS outputs and three DCLS inputs are available for e.g., 1PPS,
xPPS, IRIGB 00x, HaveQuick, ASCII ToD signal transmission.
Single-ended Serial Lines
VersaSync provides up to 3 RX and 3 TX RS232 interfaces for e.g., ASCII ToD – NMEA 0183
(ICD-GPS-153).
Differential Serial Lines
Up to four differential serial lines are available. Each of them can be set in either RS422 or
RS485 electrical standard, and used as input or output. One can be used in CAN mode. PPS
or Time-of-Day messages will be available, as well as HaveQuick and ICD GPS-060. Note that
this kind of interface uses two Channels.
Non-Configurable Pins
Channel # 0 provides a DCLSTTL output signal that is not user-configurable.
Also note that pins # 19 through 26 are reserved for the USB command line interface.
2.6.1.2 I/O Signal Mapping Table
Each Channel (i.e., each pin pair e.g., "3&4" = Channel 1) can serve as only one interface,
and not all combinations are possible due to the internal multiplexer architecture.
Spectracom provides an online interactive I/O switch matrix configurator that can be used to
design a custom I/O configuration:
http://manuals.spectracom.com/VSS/Content/VSS/SETUP/IOpinConfiguration.htm.
2.6 Configuring Inputs/Outputs
CHAPTER 2 • VersaSync User Manual Rev. 6.0
37
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