Acromag SP33 0700 Series, User Manual, Page: 34 / 37

Acromag, Inc. Tel: 248-295-0880 - 34 - https://www.acromag.com
Model SP33X-0700
4-Wire DC I/V Signal Splitter w/USB
Output...continued
USB Interface
USB MINI-B socket for temporary connection to a PC or laptop for configuration and
calibration purposes. USB isolation is required when input is connected to a
grounded input sensor (see “IMPORTANT” below). During reconfiguration &
recalibration, the transmitter receives its power from its DC power connection (via
DIN rail bus or power terminal TB5), not USB. As such, you must connect power to
the unit when you connect USB.
CAUTION: Do not attempt to connect USB in a hazardous environment. Transmitter
should be set up and configured in a safe environment only.
Data Rate: USB v1.1 full-speed only, at 12Mbps. Up to 32K commands per second.
USB 2.0 compatible.
Transient Protection: Adds transient voltage protection on USB power & data lines.
Cable Length/Connection Distance : 5.0meters maximum.
Driver: No special drivers required. Uses the built-in USB Human Interface Device
(HID) drivers of the Windows Operating System (Windows XP or later versions only).
USB Connector: 5-pin, Mini USB B-type socket, Hirose UX60-MB-5S8.
USB PIN DEFINITION
1 +5V Power (Transient Protected, but not used by the module)
2 Differential Data (+)
3 Differential Data (-)
4 NC – Not Connected
5 1 Power Ground (Connects directly to Signal Ground)
SHLD
1
Signal Ground (Connects directly to Signal Ground)
1
Note: Most Host Personal Computers (except battery powered laptops) will connect
earth ground to the USB shield and signal ground.
IMPORTANT – USB Isolation is Required: The input of this unit is isolated from both
outputs and may be connected to grounded or un-grounded input sensors, but the
input circuit ground connects in common to the USB power/signal/shield ground.
This will in-turn make a connection to earth ground at the PC when directly
connected to the USB port of a Personal Computer if you do not use an isolator.
Failure to connect USB without isolation would short the 1.25V input bias supply to
input ground if the sensor is also earth grounded, interfering with operation,
truncating the negative input range, and possibly shifting the output. For this reason,
USB isolation is strongly recommended when connecting to a PC. In the absence of
USB isolation when connected to a grounded input sensor, a battery powered laptop
could be used to connect to the unit instead, as the laptop does not normally
connect to earth ground.
!
INPUT OUT RESPONSE TIME TO 98% OF TRANSITION (TYPICAL)
FILTER SP336 SP337 SP338
NONE 28ms 11ms 39ms
LOW 34ms 38ms 59ms
MEDIUM 115ms 121ms 158ms
HIGH 1060ms 1050ms 1168ms