Services Available |
---|
The SDM-SIO1 is an RS-232, RS-422, or RS-485 serial expansion module. Up to fifteen SDM-SIO1 modules may be connected to a single datalogger SDM interface. This module is commonly used to interface serial sensors to a datalogger. Please refer to the Compatibility information regarding which dataloggers the SDM-SIO1 may be used with.
The SDM-SIO1 is a serial expansion module that allows a data logger to communicate with serial devices that interface using true RS-232, RS-422, or RS-485 signals. Up to fifteen SDM-SIO1 modules may be connected to a single data logger SDM interface. Remote serial devices use industry standard hardware and protocols to connect to the data logger through the SDM-SIO1 interface. When operating in the RS-232 mode, the module also provides hardware handshaking. The SDM-SIO1 Module is implemented in such a way that it looks like a built-in serial port to the user when writing programs in CRBasic. This means that all the user needs to do is define the address of the SDM-SIO1, using a rotary switch on the side of the unit. The serial port can then be used as if it were built into the data logger.
Modes of Operation |
|
Data Rates | 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 bps |
Data Format |
|
EMC Compliance | Complies with IEC 61326. |
Power Supply Connection | +12 V |
Operating Voltage |
|
Operating Temperature | -25° to +55°C |
Dimensions | 5.4 x 8.0 x 2.5 cm (2.2 x 3.1 x 1.0 in.) |
Current Drain |
|
Standby |
|
Active | 5 to 13 mA (depending on transmit mode and connections made) |
Buffer |
|
Storage Type | Both transmit and receive buffers are fill and discard. |
Transmit-Buffer Size | 767 bytes (buffer from data logger to sensor) |
Receive-Buffer Size | 2047 bytes (buffer from sensor to data logger) |
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Product | Compatible | Note |
---|---|---|
CR1000 (retired) | ||
CR200X (retired) | ||
CR211X (retired) | ||
CR216X (retired) | ||
CR3000 (retired) | SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. | |
CR5000 (retired) | The CR5000 operating system must be OS 6 or higher. SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. |
|
CR6 | ||
CR800 (retired) | ||
CR800 (retired) | ||
CR850 (retired) | ||
CR850 (retired) | ||
CR9000X (retired) | The CR9000X operating system must be OS 6 or higher. |
The SDM-SIO1A does NOT support auto baud rate detection nor the use of the serial port for general PakBus communications.
The SDM-SIO1 requires a desiccated, non-condensing environment. The SDM-SIO1 has built-in keyhole flanges for mounting to the backplates of Campbell Scientific enclosures.
Current firmware for the SDM-SIO1.
Note: If your version of DevConfig does not support the download of *.hex files, you will need to type in the file name directly or display it by typing *.hex and selecting the file name from the filtered list.
Number of FAQs related to SDM-SIO1: 9
Expand AllCollapse All
Yes. This feature was added in 2013. Ensure that both the data logger operating system and the SDM-SIO1 firmware are up to date. Using an SDM-SIO1, the data logger can be a Modbus client or server, although the intended and most common use is for client operation. In CRBasic, use the SerialOpen() instruction to configure the SDM-SIO1 interface and the ModBusClient() instruction to issue Modbus commands.
The SDM-SIO1 acts as a virtual serial terminal to a CRBasic data logger. The data logger’s serial functions can be used to control the device.
Use four SDM-SIO1s or a single SDM-SIO4.
An interface is required. This can be done using an SDM-SIO1, or a third-party RS-422 to RS-232 converter.
It depends. It is possible to connect serial sensors to a data logger without the use of an SDM-SIO4. However, if the sensors require hardware flow control or true RS-232 voltage levels, an SDM-SIO4 may be needed. The SDM-SIO1 also works with RS-485 signals and is a preferred alternative to the SDM-SIO4.
The CR5000 does not natively support communication with serial sensors; however, SDM-SIO1 modules can be added to collect data from serial sensors.
The CR1000, CR3000, and CR800-series data loggers can be used to collect and process binary data from smart sensors via serial or TCP/IP socket connections. In some cases, a converter or communications peripheral may be required.
Note: The capabilities mentioned above are not available for the CR200X-series, CR5000, and CR9000X data loggers.
The MD485 RS-485 Multidrop Interface is a general communication interface or serial converter. Additionally, the MD485 can be used without a data logger and offers collision avoidance for PakBus communications.
The SDM-SIO1 Serial Input/Output Module is designed for acquiring data from smart serial sensors, rather than for general communications like data collection or program downloads. The SDM-SIO1 can operate in half- and full-duplex modes, has a smaller form factor, works with RS-422, and can be daisy-chained in quantities of up to 15 on a single three-wire SDM port.
Not the same, but similar. The SDM-SIO4 provides RS-232 voltage levels; the CR1000 control ports provide 0 to 5 V only. Both usually work with all sensors, and both devices are compatible with RS-232 and TTL logic. The CR1000 is easier to set up and program for serial input. The SDM-SIO1 is a preferred alternative to the SDM-SIO4.
When compared to the CR10X, the CR1000 can handle strings as a specific data type. It also has more integrated serial interfaces including the following:
The serial I/O capabilities of the CR1000/CR3000 are similar to, and faster than, the SDM-SIO4 capabilities on a CR10X or CR23X. SDM devices are addressable and are connected to a datalogger on C1 through C3. Therefore, one benefit of using multiple SDM devices on a CR1000 datalogger is that only three control ports are used.
We've updated our privacy policy. Learn More