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          For ADAM-4520, Apter Power arranges quotations, Advantech manuals, and exact RS-232-to-RS-422/485 converter matching.

        ADAM-4520

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        Advantech ADAM-4520 is an isolated serial converter that links an RS-232 host port to a two-wire RS-485 or four-wire RS-422 field network.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for ADAM-4520

        • Manufacturer:
          Advantech
        • Part Number:
          ADAM-4520
        • Product Family:
          Advantech
        • Product Type:
          Isolated RS-232 to RS-422/485 Converter
        • Stock:
          1
        • Converter direction:
          RS-232 to RS-422/485
        • RS-232 interface:
          Female DB9
        • Field interface:
          Plug-in screw terminal, #14–22 AWG
        • RS-485 mode:
          2-wire
        • RS-422 mode:
          4-wire
        • Isolation voltage:
          3,000 VDC
        • Baud-rate range:
          1,200 bps to 115.2 kbps
        • Control modes:
          RTS control and switchable RS-422 mode
        • Data-format settings:
          9, 10, 11, or 12 bits
        • Factory baud-rate setting:
          9,600 bps
        • Factory data-format setting:
          10 bits
        • RS-485 data-flow control:
          Automatic
        • Power input:
          10–30 VDC, reverse-polarity protected
        • Power consumption:
          0.8 W typical; 1 W maximum at 24 VDC
        • Operating temperature:
          -10 to +70 °C
        • Storage temperature:
          -25 to +85 °C
        • Operating humidity:
          5–95% RH
        • Status indication:
          Power and data-flow LEDs
        • Tariff Code:
          8517629900
        • Country of origin:
          Taiwan
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Port Conversion Isolation & Protection Switch Settings Wiring & Power

        Features:

        • A female DB9 converts the host RS-232 signal to two-wire RS-485 or four-wire RS-422.
        • The field interface is separated by 3,000 VDC isolation and includes RS-485 surge protection.
        • Internal switches select serial framing and line mode, while LEDs distinguish power and data direction.
        Advantech ADAM-4520 connects a conventional RS-232 host to a longer multidrop RS-485 or point-to-point RS-422 field link.

        Automatic RS-485 direction control handles transmit and receive changes without an addressable command from the host.

        Power, framing, baud rate, and two-wire/four-wire mode are established at the converter before the field network is energized.

        The Advantech ADAM-4520 Isolated RS-232 to RS-422/485 Converter is covered by the staged manufacturer documentation; Apter Power can assist with quotations, manuals, and exact-model matching.
        Advantech ADAM-4520 Isolated RS-232 to RS-422/485 Converter Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Host-to-Field Signal Flow

        • Host connector: The female DB9 receives the RS-232 transmit, receive, and control signals from the host.
        • Two-wire path: In RS-485 mode, one differential pair alternates between transmitted and received data.
        • Four-wire path: In RS-422 mode, separate transmit and receive pairs carry data simultaneously.
        • Direction handling: Automatic data-flow control changes the RS-485 line direction as serial traffic passes through the converter.

        Electrical Separation

        • Isolation barrier: The RS-232 side and field interface are separated by a 3,000 VDC isolation rating.
        • Field-line protection: Surge protection is applied to the RS-485 data line.
        • Power protection: The 10–30 VDC input includes reverse-polarity protection.
        • Status boundary: Power and data-flow LEDs show whether the issue is at the supply or in one direction of the serial path.

        Internal Serial Configuration

        • Data framing: SW1 selects 9-, 10-, 11-, or 12-bit serial frames.
        • Rate selection: SW2 selects 1,200 bps through 115.2 kbps, with 9,600 bps as the factory setting.
        • Default frame: The factory data format is 10 bits: one start bit, eight data bits, no parity, and one stop bit.
        • Line mode: RTS control and four-wire RS-422 operation are switchable alternatives to automatic two-wire RS-485.

        Terminal and Supply Checks

        • Field conductors: The plug-in terminal accepts #14–22 AWG conductors for the RS-422/485 pair or pairs.
        • Supply range: An unregulated 10–30 VDC source powers the converter through the protected input.
        • Host connection: The RS-232 cable lands on the female DB9 rather than sharing the field terminal.
        • Network consistency: Every device on the serial path must use the selected baud rate and compatible frame format.
        View as PDF
        Description
        Advantech ADAM-4520 is an isolated serial converter that connects one RS-232 host interface to an RS-485 or RS-422 field link. The female DB9 carries the host-side serial signals, while the plug-in screw terminal provides the two-wire or four-wire connection to the field network.

        Between those interfaces, ADAM-4520 separates the host port from the field cable with a 3,000 VDC isolation barrier. The converter also protects the RS-485 data line against surge conditions, keeping the electrical boundary and the protocol-conversion path in the same module.

        Serial framing in ADAM-4520 is set by internal switches for 9-, 10-, 11-, or 12-bit data formats and rates from 1,200 bps to 115.2 kbps. Automatic RS-485 data-flow control changes the line direction without requiring an addressable command, while RTS control and four-wire RS-422 operation remain selectable modes.

        Power for ADAM-4520 enters through the 10–30 VDC reverse-polarity-protected input. Front indicators show power and transmission direction, so host-to-field and field-to-host activity can be distinguished while checking the DB9, terminal wiring, and switch settings.
        Alternative Names
        ADAM4520 Advantech ADAM-4520 ADAM 4520 ADAM-4520 RS-232 Converter ADAM-4520 RS-422/485 Converter ADAM-4S20 ADAM 45 20 Advantech ADAM4520
        Technical notes
        Advantech ADAM-4520 uses internal switches for baud rate, data format, and RS-422/RS-485 selection; host and field devices must use the same serial framing.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why can Advantech ADAM-4520 show power but pass no serial data?
        With Advantech ADAM-4520 powered, compare the host baud rate and framing with SW1 and SW2, then confirm that RS-422 or RS-485 mode matches the field wiring. A valid supply does not correct a framing or line-mode mismatch.
        How should the two-wire network be connected to Advantech ADAM-4520?
        Use the RS-485 differential pair on the plug-in terminal of Advantech ADAM-4520 and keep the polarity consistent across the network. The converter automatically changes direction as host traffic enters or leaves the pair.
        What changes when Advantech ADAM-4520 is set to RS-422 mode?
        In RS-422 mode, Advantech ADAM-4520 uses separate transmit and receive pairs, so the rate switch is not used in the same way as automatic two-wire RS-485 operation.
        Why must the frame length match every device connected through Advantech ADAM-4520?
        Advantech ADAM-4520 does not translate parity or stop-bit structure; it forwards the selected 9-, 10-, 11-, or 12-bit frame. A different device format breaks character boundaries even when the baud rate is correct.
        Which side of Advantech ADAM-4520 is protected by the 3,000 VDC isolation barrier?
        The 3,000 VDC rating of Advantech ADAM-4520 separates the RS-232 host interface from the RS-422/485 field side, reducing direct ground-potential transfer across the converter.
        What should be checked when the Advantech ADAM-4520 data-flow LED shows only one direction?
        At Advantech ADAM-4520, verify the return pair or two-wire polarity, confirm that the field device is replying with the selected framing, and inspect the DB9 receive path before changing the network rate.

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