Overview
The SC32B Optically Isolated Interface is used to connect the CS I/O port on a data logger with the RS-232 port on a PC. This interface converts the RS-232 voltage levels of the computer to the CMOS levels of the data logger. It also isolates the electrical system of the computer from the data logger, thereby protecting against ground loop, normal static discharge, and noise.
Read MoreBenefits and Features
- Connects a PC to the CS I/O port of a data logger
- Helps protect components from electrical damage
- No power source needed—powered by data logger and PC
- Ships with cables needed for most uses
- Baud rates up to 115 kbps supported
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Detailed Description
The SC32B, or another interface, is required for direct communications between a PC and a CR510, CR10X, or CR7 datalogger. For our CR800, CR850, CR1000, and CR1000X dataloggers, the SC32B is often used to provide optical isolation between the data logger and PC. Although the on-board RS-232 port of the CR3000, CR5000, or CR9000X dataloggers is isolated, the SC32B can be interfaced with their CS I/O port when a second RS-232 port is required in the application.
The SC32B is shipped with an SC12 (2 ft) cable for attachment to the data logger and a 10873 (6 ft) cable for attachment to the PC. Alternatively, an SC12R-6 (6 ft) cable (purchased separately) can be used instead of the standard SC12 when a longer cable is needed.
The SC32B can support RS-232 cable lengths of up to 50 feet; longer cable lengths are not recommended. The longer cable should be on the data logger side of the interface (CMOS logic levels) as opposed to the RS-232 side, which is typically more sensitive to drops in signal voltage levels.
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Data Loggers
| Compatible | Note | |
|---|---|---|
| CR9000 (retired) | The CR9000 requires a CR9080 PAM module. |
Additional Compatibility Information
Data Logger Considerations
The SC325B is compatible with data loggers that have a CS I/O port.
Specifications
| Baud Rates Supported | Up to 115 kbps |
| Power | Drawn from the serial ports of the PC and data logger |
| Typical Current Drain |
|
| Connections | 9-pin RS-232 socket (female) port configured as DCE; 9-pin pin (male) port |
| Operating Temperature Range | -25° to +50°C |
| Dimensions | 4.1 x 2.3 x 7.6 cm (1.6 x 0.9 x 3.0 in.) |
| Weight | 45.4 g (1.6 oz) |
Related Documents
Product Brochures
Compliance
Listed Under
FAQs for
Number of FAQs related to SC32B: 11
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Non-isolated interfaces (that is, connection to the RS-232 port with a standard serial cable connection) can cause ground offset errors in analog measurements using a system connected to a PC and powered by an ac source. The SC32B provides isolation that may be important when recording low-level, single-ended voltage measurements.
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No. The SC32B cannot be used at the same time as an SDC device. The SC32B is a modem-enabled device and is not capable of concurrent communication.
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No, because it would not work. The SC32B is used to do the following:
- Convert data logger logic levels (on the CS I/O port) to RS-232 levels
- Optically isolate the data logger from the RS-232 peripheral
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The SC929 has been functionally replaced by the SC32B. While the SC929 is still available, the SC32B has increased capability at a reduced cost. See the table for a comparison:
SC929
SC32B
Optically Isolated
No
Yes
Maximum Baud
9600
115200
Current Draw
8 mA
Active < 200 µA
Cables are an additional comparison point for these two products:
- The SC929 cable directly connects the PC to the data logger’s CS I/O port.
- The SC32B interface typically uses the 10873 serial cable to connect to the PC and the SC12 cable to connect to the CS I/O port. Both of these cables are shipped with the SC32B.
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There are several differences:
- The SC32A requires a 25-pin serial cable between the computer and interface. The SC32B, on the other hand, has DB9 connectors for both the data logger and computer side.
- The SC32B cannot be configured to pass serial printer or computer data.
For comparisons, see the SC32A product page and the SC32B product page.
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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.
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See the table for a detailed comparison:
17394
USB-serial cableSC32B
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
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Many of our more recent data loggers have a Micro 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:
- Use the SC-USB connector/interface instead of the SC32B.
- Use the SC32B with a 17394, USB-to-9-pin male RS-232 cable.
- 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.
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The SC32B is not needed for a data logger that has an RS-232 port. If the RS-232 port is not being used by another peripheral, the port can be used with a serial cable or a serial-to-USB cable to connect to the computer.
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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 an SC32B. 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 as pn 17394, can be used with the SC32B. Alternatively, instead of the SC32B, use the SC-USB.