Limited Availability ›
This product has limited availablity. Some accessories, replacement parts, or services may still be available when it is no longer available.
SDM-CD16D 16-Channel Digital Control Port Module
Expands Low-Voltage Control Capacity
For low-power applications
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The SDM-CD16D increases the number of digital outputs that can be controlled by a Campbell Scientific datalogger. The SDM-CD16D is commonly used to drive normal logic level inputs.

Read More

Benefits and Features

  • Intended for low-voltage, low-power applications not suitable for the SDM-CD16AC


Detailed Description

The SDM-CD16D increases the number of digital outputs that can be controlled (i.e., set to 0 or 5 V) by a Campbell Scientific datalogger. In addition to being able to drive normal logic level inputs, when an output is set HI, a boost circuit allows it to source a current of up to 100 mA for controlling low voltage valves, relays, or other devices.

Up to 15 SDM-CD16Ds may be addressed, making it possible to control a maximum of 240 ports from the first three datalogger control ports.

Datalogger Connection

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.


Operating Temperature -25° to +70°C
Operating Voltage 9 to 18 Vdc
Current Drain 100 µA typical (all ports HI, no load)
EMC Status Complies with EN55022-1:1998. and EN50082-1:1998.
Output Voltage (no load) Output ON/HI, nominal 5 V (minimum 4.5 V)
Output OFF/LO Nominal 0 V (maximum 0.1 V)
Output Source Current Output sources 36 mA @ 3 V, 115 mA short-circuited to ground
Maximum Output Current (total all outputs) 400 mA and 50°C and 12 V supply
(The maximum current [total all outputs] should be derated by 50 mA for every 10°C above 50°C and/or 50 mA for every voltage above 12 V.)
  • 18.0 x 9.9 x 2.0 cm (7.1 x 3.9 x 0.8 in) without mounts
  • 23.4 x 9.9 x 2.0 cm (9.2 x 3.9 x 0.8 in.) with mounts
Weight 318 g (11 oz)


Datalogger Considerations

Up to 15 SDM devices can be connected to a single datalogger. To communicate with connected SDM devices, the CR3000 and CR5000 use the SDM-C1, SDM-C2, and SDM-C3 ports. The other dataloggers use ports labeled C1, C2, and C3. The 21X also requires channel 1H.


The SDMCD16AC Instruction controls SDM-CD16D operation in CRBasic. Edlog Instruction 29 controls SDM-CD16D operation in the CR7, and Edlog Instruction 104 controls SDM-CD16D operation in the CR10(X), CR23X, and 21X dataloggers.

Compatible Contemporary Dataloggers

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

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR5000 CR7X CR9000
* **

Datalogger Notes:
*For the CR3000 and CR5000, SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.

**On the CR7X, SDMs connect to the C1, C2, and C3 terminals provided on the CR700X control module (after Sept 1996).

Power Considerations

The maximum output current that the SDM-CD16D can source is 400 mA. The power requirements are large compared to most Campbell Scientific products when driving significant loads. For many applications, an external rechargeable power supply is recommended to power the SDM-CD16D. This power supply should share a common grounding point with the datalogger. For some applications, the datalogger's sealed rechargeable battery may suffice; in this case, float-charging the batteries from an ac source is recommended.

Enclosure Considerations

The SDM-CD16D requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the flanges/bracket to the backplate of our enclosures.

Compatible Enclosures

ENC10/12 ENC10/12R ENC12/14 ENC14/16 ENC16/18 ENC24/30 ENC24/30S