SC-USBOptically Isolated USB Interface

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1. How do the 17934, the SC32B, the SC929, and the SC-USB compare?

   See the table for a detailed comparison:

   	17394 USB-serial cable	SC32B	SC929	SC-USB
   Useful for Connecting	PC USB port to data logger RS- 232 port	Data logger CS I/O port to laptop COM port	Data logger CS I/O port to laptop COM port	Data logger CS I/O port to PC USB port
   Connectors	USB A male – 9-pin male	9-pin male – 9-pin female	9-pin male – 9-pin female	USB B female – 9-pin male
   Length	6 ft	3 in.	6 ft	1.6 in.
   Power Consumption	N/A	Active <200 a="" --200--="">	8 mA continuous	Active <20 ma="" --20--="">
   Optically Isolated	No	Yes	No	Yes
   Operating Temperature	N/A	-25° to +50°C	-25° to +50°C	-25° to +50°C
   Maximum Data Transfer Rate	1 Mbps USB	115200 bps	9600 bps	1 Mbps USB

2. If a computer does not have any serial ports, how can software (such as LoggerNet, PC400, PC200W, or Device Configuration Utility) talk to the data logger?

   我们的许多最近的数据记录器微B USB port. Simply use a Type A to Micro B, male-to-male cable. Although any USB cable, with the correct connectors and drivers, should work, there is a better chance of success using a cable supplied by Campbell Scientific.

   For data loggers with an RS-232 port, only a serial or USB to RS-232 cable (sometimes called a USB-to-serial-adapter cable) is needed. Although any USB to RS-232 cable should work with the appropriate drivers, there is a better chance of success using the USB to RS-232 cables sold by Campbell Scientific.

   There are several options for data loggers that don’t have an RS-232 port but have a CSI/O port:

   1. Use theSC-USBconnector/interface instead of theSC32B.
   2. Use the SC32B with a17394, USB-to-9-pin male RS-232 cable.
   3. Use a user-supplied USB interface with the SC32B.

   For data loggers with a CSI/O and RS-232 or USB port, it is not necessary to use the SC32B unless there is another device connected to the RS-232 port or there are concerns about low-level noise from a permanently connected, ac-powered computer.

3. Is a 17394 connected to an SC32B basically the same as an SC-USB?

   The combination of the USB to serial (17394) and the SC32B is basically the same as the SC-USB. Both options enable communication between a computer and a data logger with a CS I/O port.

4. How is communication achieved through a data logger CS I/O port?

   Communication through the data logger’s CS I/O port requires an interface that converts the computer’s RS-232 voltage levels to the CMOS levels of the data logger. Typically, that interface is anSC32B. The SC32B connects to the data logger’s CS I/O port via an SC12 or serial cable and connects to a computer’s 9-pin serial port via a serial cable. When the computer does not have a serial port, a 9-pin serial-to-USB cable, such aspn 17394, can be used with the SC32B. Alternatively,instead of the SC32B, usetheSC-USB.