SDM-SIO1A Módulo serie I/O de 1 canal
Expansión puerto serie I/O para dataloggers
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El SDM-SIO1A es un módulo de expansión puerto serie I/O para dataloggers Campbell Scientific. Se ha diseñado para añadir un puerto serie adicional RS-232, RS-422, o RS-485 (half- o full-duplex) a un datalogger compatible SDM, con el objetivo de interactuar con sensores inteligentes, actuadores o visualizadores. Se pueden conectar hasta 15 módulos SDM-SIO1A al puerto SDM del datalogger. El SDM-SIO1A se comporta de forma similar al puerto serie nativo del datalogger y utiliza los mismos típicos comandos de E/S serie. El SDM-SIO1A incluye protecciones contra transitorios y descargas en el interface puerto serie según norma IEC61000-4-5 level 4, lo cual evita tener que adquirir a parte un protector contra sobretenciones.

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Ventajas y características

  • Forma fácil y compacta de añadir hasta 15 puertos serie adicionales a un datalogger Campbell Scientific compatible con módulos SDM
  • Total conformidad con los estándares RS-232, RS-422, y RS-485 (half- y full-duplex)
  • Capacidad de mantener grandes cantidades de datos del sensor serie en el buffer entre el procesado de tareas del datalogger
  • Compatible con el modo terminal "talk-through", que permite comprobar y diagnosticar el dispositivo serie
  • Incluye protecciones contra transitorios y descargas en el interface puerto serie, lo cual evita tener que adquirir a parte un protector contra sobretenciones.
  • Bajo consumo en reposo, ideal para estaciones alimentadas por batería


Descripción detallada

The SDM-SIO1A connects to a remote serial device using industry-standard hardware that can be set to true RS-232, RS-485, or RS-422 signal levels. When operating in RS-232 mode, the module also supports hardware handshaking. RS-422 mode is functionally the same as RS-485 mode, except the connection is limited to a point-to-point system. Connections and programming for RS-422 are otherwise identical to RS-485.

The SDM-SIO1A will accept serial data up to 6143 bytes and store it in its buffer. This allows remote equipment to transmit large amounts of data without needing to stop other processes in the datalogger.

Up to 15 SDM-SIO1A modules can be connected to a single datalogger using the SDM port, allowing a user to connect 15 different serial devices to a datalogger with ease. This is in addition to any connections made to the dataloggers via other serial ports.

The SDM Jumper Wire Kit (pn #32505) connects up to four SDMs to the datalogger. This kit is recommended when multiple SDMs are connected to one datalogger or for extremely short distances between the SDM and datalogger. The CABLE5CBL-L cable is recommended for connecting a single SDM to the datalogger, and for longer distances between the SDM and datalogger.


Function Expands the number of serial devices that can communicate with a data logger.
Number of Channels 1
Supported Data Rates 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 bits/s
Supported Modes of Operation
  • Hardware CTS/RTS flow control is supported in RS-232 mode. The handshaking lines can also be used as general purpose I/O lines.
  • RS-232 (full duplex and receive only)
  • RS-485 (half and full duplex)
  • RS-422 (half and full duplex)
Supported Data Format
  • In 7-bit mode with no parity, the user must ensure that the characters received by the SDM-SIO1A have a delay of at least one bit period or greater between them. This does not affect any other configuration and does not affect transmissions out of the SDM-SIO1A.
  • 8, 7 bit data size; none, odd, or even parity; one or two stops bits
Auto Baud Rate Detection Not supported
PakBus Communications Use of the serial port for general PakBus communications is not currently supported.
  • Power supply +12 V connection
  • 7 V (minimum)
  • 12 V (nominal)
  • 30 V (maximum)
Operating Temperature -40°C to +70°C (standard)
Standard Humidity Range 0 to 95% (non-condensing)
EMC Compliance The SDM-SIO1A has been tested and shown to comply with IEC 61326. The device incorporates transient and surge protection that is designed to meet IEC61000-4-5, level 4, providing the device is adequately grounded.
Mounting Clips Optional DIN rail mounting clips are available, which can be fitted to the base of the case.
Mounting Holes Two spaced 7.6 cm (3 in.) apart
Dimensions 6.4 x 6.25 x 2.2 cm (2.51 x 2.46 x 0.86 in.) excluding mounting tabs

Buffer Sizes

-NOTE- Both transmit and receive buffers are fill and discard type. That is, after the buffers become full, no new information is accepted and all further data is discarded until space is made when the data logger requests data from the SDM-SIO1A.
Transmit Buffer Size 767 bytes (buffer from the data logger to the sensor)
Receive Buffer Size 6143 bytes (buffer from the sensor to the data logger)

Current Consumption

Standby Current
  • 110 µA (nominal)
  • 150µA (max)
Active Current 9.6 to 11.7 mA (depending on transmit mode and connections made)


Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.


Producto Compatible Nota
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR3000 (retired) On the CR3000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR5000 (retired) The CR5000 is compatible with the SDM-SIO1A, but the operating system must be OS 6 or higher. On the CR5000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR850 (retired)
CR9000X (retired) The CR9000X's operating system must be OS 6 or higher.

Equipos para montajes

Producto Compatible Nota

Información de compatibilidad adicional

Consideraciones datalogger

El SDM-SIO1A no admite detección automática de la velocidad ni usar el puerto para comunicaciones PakBus.

Compatibilidad con dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR7X CR9000X CR6

*En el CR3000, los módulos SDM se conectan en los terminales etiquetados SDM-C1, SDM-C2, y SDM-C3.

†El sistema operativo del CR9000X debe ser el OS 6 o superior.

Compatibilidad con dataloggers obsoletos

El CR5000 es compatible con el SDM-SIO1A, pero el sistema operativo debe serl el OS 6 o superior. En el CR5000, los módulos SDM se conectar en los terminales SDM-C1, SDM-C2, y SDM-C3.

Compatibilidad con dataloggers Edlog

Ninguno es compatible con el SDM-SIO1A.

Consideraciones armario intemperie

El SDM-SIO1A requiere un ambiente sin condensación; recomendamos usar nuestros armarios intemperie. El SDM-SIO1A se entrega con tacos de plástico para fácil montaje en la placa de montahe de los armarios Campbell Scientific.

Armarios compatibles

ENC10/12 ENC10/12R ENC12/14 ENC14/16 ENC16/18


SDM-SIO1A / SDM-SIO4A OS v.3.0 (401 KB) 10-01-2024

Current firmware for the SDM-SIO1A and SDM-SIO4A.

Historial revisiones

Casos de aplicación

Croatia: Modernisation of a Countrywide Weather Observation Network
Overview The National Weather Observation Network in Croatia, led by the Croatian Meteorological and Hydrological Service......leer más

Artículos y notas de prensa