Synrad FH FLYER - USB Port; USB Connections; Electrical Isolation;Electrical Noise

technical reference
SYNRAD FH Series Flyer Operator’s Manual Version 3.4
141
FH Smart I/O Connector Flyer DB-25 I/O Connector
Pin # Function Pin # Function
10 OUT6/OUT7 RTN 3 OUT6_A
12 OUT4 *2 OUT2–OUT7_B
23 OUT6 *2 OUT2–OUT7_B
24 OUT4/OUT5 RTN 4 OUT4_A
* On the Flyer DB-25 User Interface connector, outputs OUT2–OUT7 share a common return—OUT2–7_B on Pin 2. Because FH
Smart OUT4/OUT5 and OUT6/OUT7 share common returns, only two outputs (OUT4 and OUT6) can be used in this current
sourcing conguration. This wiring scheme assumes that FH Smart outputs OUT4–OUT7 are all tied to the I/O supply’s positive
DC (V+) voltage (FH Smart outputs are sourcing current).
If
four or more outputs are required in a current sourcing arrangement (FH Flyer oers a total of eight out-
puts—two with isolated return lines, the other six share a common return), then rewire your Smart
output circuitry to take advantage of this functionality. Refer back to Table 6-10 for a list of possible
output signal configurations.
USB port
The USB port section includes subsections:
 USB connections
 Electrical isolation/electrical noise
USB connections
FH Series Flyer marking heads incorporate an isolated USB (Universal Serial Bus) connection between
the host and the head. This connection provides communication between WinMark Pro and the Flyer
head when marking, testing, or when conguring Flyer’s Ethernet port. Flyer heads support USB V2.0 Full
Speed connections with a data bandwidth of 12 million bits per second (Mbps). It is not necessary to
power down Flyer or your computer when connecting or disconnecting the cable; USB protocol allows the
ability to “hot” plug and unplug.
The Flyer ship kit includes a six-foot (1.8 m) long USB Communication cable. If a longer USB cable is re-
quired, SYNRAD highly recommends buying a USB extension cable. Please note that the USB specica-
tion does not permit an overall USB cable length longer than 16.4 feet (5.0 m). When supplying your own
USB cable, please ensure that it is double-shielded. This prevents electrical noise in industrial environ-
ments from interfering with communications between your computer and the Flyer head.
Important Note: Before installing or upgrading WinMark Pro software, rst disconnect DC power or
unplug the USB cable from the Flyer head. This ensures that the Windows OS will
load and install the latest Flyer USB driver.
Electrical isolation/electrical noise
In situations where two AC powered devices are connected via an electrical connection, such as a USB
cable, a large dierence in the ground potential (voltage) can develop between these devices. For example,
when the DC power supply for an FH Flyer marking head is powered from a dierent AC circuit than
the circuit powering the personal computer or controller, the USB Communication cable can complete a
ground loop that may damage the USB port in the marking head or in the computer or controller, render-