I/O Signal Mapping Table - Spectracom VersaSync Quick Reference Manual

2.6 Assigning I/O Pins
Table 2-8:
PPS
IRIG
HQ
GPIO
ASCII
Note: ASCII Time Code is abbreviated in the UI as
DCLS Signal Lines
Up to six TTL (5V) or 10 V DCLS outputs and three DCLS inputs are available for e.g., 1PPS,
xPPS, IRIG B 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 # 1 provides a DCLS TTL output signal that is not user-configurable.
Also note that pins # 19 through 26 are reserved for the USB command line interface.
2.6.2

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 cus
tom
configuration:
http://manuals.spectracom.com/VSS/Content/VSS/SETUP/IOpinConfiguration.htm
The table below illustrates which signal combinations can be assigned to the 18 configurable
pins.
22
Available signal types
DCLS, TTL DCLS, 10V
out (5), in (2) out (1), in (1)
out (5), in (2) out (1), in (1)
out (5), in (2) out (1), in (1)
out (5) out (1)
CHAPTER
RS485 RS 485, 120 Ω
out (4), in (4) in (4)
out (4), in (4) in (4)
out (4), in (4) in (4)
out (4), in (4) in (4)
ATC
.
•
2 VersaSync Evaluation Kit Quick Reference Guide Rev. 5
RS232
out (3), in (3)
I/O
.