Module 1 cổng RS-232/422/485 Campbell Scientific SDM-SIO1A

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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SDM-SIO1A 1-Channel Serial I/O Module

Gọi 0904251826 để được trợ giúp

Module 1 cổng RS-232/422/485 Campbell Scientific SDM-SIO1A


The SDM-SIO1A is a serial I/O expansion module for Campbell Scientific dataloggers. It is designed to add an additional RS-232, RS-422, or RS-485 (half- or full-duplex) serial port to an SDM-capable datalogger for the purposes of interfacing with an intelligent sensor, actuator, or display. Up to 15 SDM-SIO1A modules can be connected to a single datalogger SDM port. The SDM-SIO1A behaves much like a native datalogger serial port and uses the same familiar serial I/O commands. The SDM-SIO1A is transient and surge protected to IEC61000-4-5 level 4 on the serial port interface, avoiding the need for separate transient protection in most applications.

Benefits and Features

  • Easy and compact method to add up to 15 additional serial ports to an SDM-capable Campbell Scientific datalogger

  • Fully compliant with the RS-232, RS-422, and RS-485 (half- and full-duplex) standards

  • Can buffer large amounts of serial sensor data between datalogger processing events

  • Supports datalogger terminal "talk-through" mode, facilitating serial device testing and diagnostics

  • Includes transient and surge protection on the serial port interface, eliminating the need for separate transient protection

  • Low idle power consumption, which is ideal for battery-powered stations

Detailed Description

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.


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)

Temperature Range

-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 76 mm (3 in.) apart


64 x 62.5 x 22 mm (2.51 x 2.46 x 0.86 in.) excluding mounting tabs

Buffer Sizes


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 datalogger requests data from the SDM-SIO1A.

Transmit Buffer Size

767 bytes (buffer from the datalogger to the sensor)

Receive Buffer Size

6143 bytes (buffer from the sensor to the datalogger)

Current Consumption

Standby Current

  • 110 µA (nominal)

  • 150µA (max)

Active Current

9.6 to 11.7 mA (depending on transmit mode and connections made)



SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules


SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules


SDM-SIO1A EU Declaration of Conformity

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