Sơ đồ chân cổng giao tiếp RS-232, RS-485

Serial Control Adapters

Serial control adapters provide an easy way to use Cat5/5e/6 cabling to connect the RJ-45 serial port of a Savant controller to a DB-9 serial port on an external device without the need to manually arrange wiring based on device pinout or specifications. The table below shows Savant's pre-built adapters available through the Savant Store. The pre-built adapters are color coded - see the specifications table below for details. NOTE: Savant recommends using TIA/EIA-568B standard for all Cat5/5e/6 cabling.

Adapter Color

Serial Type


No flow and no null (Straight)


Flow and no null (Straight)


No flow and Null


Flow and Null


DB-9 mini gender changer (Female to Male)

Most profiled devices that have RS-232 control will specify which color adapter is required for interfacing with the component within Blueprint. To find this information in Blueprint do the following:

  1. Select the device.

  2. Open Inspector.

  3. In the Show drop-down menu, select Control Ports.

  4. Select RS-232, RS-422, or RS-485 depending on the component. The image below is an example of fields displayed, with descriptions of the information provided.

Name on Component

Control Type


Preferred Baud Rate

Supported Baud Rates

Data Length

Stop Bits


Flow Control

Connector Type

Cable Type

Adapter Color

Conversion Definitions and Diagrams

DB-9 Connector Pin Definitions

A DB-9 connector has 9 pins arranged in two rows, with one row on top of the other. The top row has 5 pins and the lower row has 4 pins. This interface is commonly used for RS-232 serial applications.

RJ-45 Wiring for RS-232 Control Pinout

RJ-45 to DB-9 for RS-232 Adapter Wiring (Flow, No Null)

RJ-45 to DB-9 for RS-232 Adapter Wiring (Flow, Null Modem)

RS-422/485 Pinouts

RS-422 and RS-485 are generally connected to the endpoint device via screw-down terminals which are marked so as to match wiring on both sides. It is also possible that RS-422 and RS-485 may have a custom connector with a custom pinout. There is no standard wiring for RS-422/485, so the pinout shown in the next table should be used simply as a reference when connecting to an RS-422/485 device. NOTE: Referring to the manufacturer's protocol documentation is always the best practice in any case where the device pinout or correct wiring is in question.

In some instances, only two wires are used (- and +) out of the 4 (TX-, TX+, RX-, RX+). When this is the case, the TX- and TX+ could be wired together, allowing the ability to transmit but no feedback. Alternatively, the TX- could be connected to the RX- and the TX+ to the RX+, creating a - and + line. Some manufacturers use A and B to represent their wires, instead of - or +. If this is the case, some trial and error may be required to determine which wire maps to A and which maps to B.

Controller RJ-45 (RS-422/485) Plug Pinouts

Pin 1


Pin 2


Pin 3


Pin 4

Ground (GND)

Pin 5

No Connection for RS-422/485

Pin 6


Pin 7

No Connection for RS-422/485

Pin 8

No Connection for RS-422/485

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