A card reader asks the door to open once. A remote changes what the door will accept until somebody changes it back. That difference decides whether your credential system still works after a keypress, and it is the part of access control integration most often missed on site.
By Edison · Published 5 November 2026 · 12 min read · Last verified: 2026-11-05
TL;DR
- A card reader is a momentary trigger: it energises one relay and the door runs an open cycle. A remote transmitter is a mode change: it rewrites which sensors, which access controller and which lock the door obeys, and holds that state until somebody changes it.
- That is why a remote and a card reader are not two ways of opening the same door. In the M-203E remote controller, two of the four keys put the access control device out of service.
- The card reader side of the integration has to be a passive contact. The M-203E receiver takes a passive contact signal or a direct PUSH input, so a powered output wired there is an error, not a feature.
- The M-203E learns up to sixteen transmitter codes by self-coding. Learning takes one second, deleting takes five, and deleting removes every code at once because codes cannot be removed individually.
- Everything else follows from the mode: the receiver draws 35 mA static and 85 mA in action, switches a 3 A lock at 12 V, and waits 0.5 seconds between unlocking and starting the door.
What a card reader actually sends to the door
The usual way to describe an access control installation is a signal path: reader, then controller, then operator. That picture is useful, but it hides the difference that causes the problems. A card reader produces one thing, a request. The controller authenticates it and energises a relay output for a set period, and one open cycle runs.
A remote transmitter produces something else, a change of state. The remote receiver on our automatic door accessories range does not send a request to open. It sends an instruction about which operating mode the door should now be in, and the door stays in that mode until the next instruction arrives.
The manual function selector and the M-203E remote expose the same family of modes, and each published description is explicit about the access control device. In full open and full lock the access control devices are invalid. In unidirectional the external access controller stays effective while the external sensor is switched off.
Because a remote rewrites what the door accepts rather than asking it to open once, a single keypress can change the behaviour of the card reader wired into the same controller. Nothing on the access control panel shows this, and the door still looks completely normal.
The three devices that decide who gets in
Three devices sit between a person and an automatic door, and they are easy to confuse because all three can end up with the same result on screen. They are not interchangeable, because each acts on a different layer of the system.
The card reader is the personal layer. It sits with the access controller and produces a momentary request on a relay. It knows about people and nothing about operating modes. The remote transmitter is the role layer: one handset issued to a manager, a cleaner or a security post, carrying the authority to put the door into a different mode. The manual function selector is the building layer, holding five positions the same mode set describes.
Because they act on different layers, they fail differently. A failed card reader leaves the door in its current mode and nobody gets in through that reader. A remote left on the wrong key changes what the door accepts for as long as it stays there. A selector turned to full lock at closing time does what the caretaker intended, and the access control system never records it. Our guide to access control integration the card reader to auto covers the operator side.
Why a remote can quietly switch your card reader off
This is the part of access control integration that catches people out. A remote is not a portable card. It is a mode switch with a radio in it, and some of the published modes take the card reader out of the circuit deliberately.
| Mode and control | Activation sensors | Card reader and access controller | Electric lock |
|---|---|---|---|
| Bi-directional, remote key D | Internal and external active | Normal operation | Released for business hours |
| Unidirectional, remote key B | Internal active, external off | External reader still works | Locked from outside |
| Full open, remote key C | Both disabled | Invalid | Released, leaf held open |
| Full lock, remote key A | Both disabled | Invalid | Locked |
| Automatic, selector | Both active | Works as normal | Released |
Read the third column before the door goes live. In unidirectional mode the card reader outside still opens the door while the electric lock stays locked from the outside, so the door admits cardholders one way only. In full open and full lock the access control devices are invalid, so the card reader is disconnected from the decision entirely.
The failure is silent because nothing in the access control system changes. The panel still shows the reader online and still records every swipe, while the door no longer responds to any of them. A remote left on key A over a weekend means the first person to arrive with a card finds a locked door and no error anywhere.
Passive contact input: the one specification that decides whether it works
The M-203E receiver has a published input definition that removes most of the guesswork. The input signal for the access controller should be a passive contact signal, or a PUSH input directly. Passive contact means the controller hands over voltage-free terminals that close when a valid credential is presented, which is the standard relay output on an access controller.
The alternative is a powered output, where the controller applies 12 V or 24 V DC to a trigger wire for the unlock period. That does not belong on a passive contact input. A receiver expecting a dry contact and handed a powered signal can behave intermittently or lose its input stage, and the symptom often appears weeks later on a door that worked during commissioning.
It is worth understanding what the receiver is, because that reframes the wiring. The published description calls the M-203E an extender: all induction gated signals are unified into the extender, which then outputs the signal to the automatic door and the electric locks. The card reader is not wired into the door. It is wired into the extender, and the extender decides what the door hears.
Two further points matter at commissioning. The system has a memory function, so a power cut does not drop the door back to an undefined state. And probes should not be powered from the extender directly; they connect to the probe terminals on the door unit instead.
Self-learning remotes and the sixteen-code ceiling
The M-203E uses self-coding. Up to sixteen transmitter codes can be learned into one receiver, and the procedure is short enough to do on site without a laptop. Press the learn button for one second and the indicator turns green, then press any key on the transmitter and two flashes confirm that it has been learned.
The deletion behaviour is the part to design around. Pressing the learn button for five seconds with the green light flashing deletes every code that has been learned, and the documentation is explicit that codes cannot be deleted one by one. One receiver therefore cannot keep a permanent code while handsets are added and removed, and a five-second press by someone who thinks they are learning a handset can wipe the whole site.
The remaining specifications set the practical limits. Transmission is at microwave level with a roller code, which is one reason the receiver has to have a transmitter learned before it responds. Remote control battery life is given as 18000 presses, the working environment range is -42 to 45 degrees Celsius, and the indicator voice weakens in deeper installation positions. Such radio devices fall under 47 CFR Part 15 in the United States, worth keeping in the file for any project importing there.
Power, current and the half second that matters
The receiver is powered from the door, not from the access controller. The published power supply is AC or DC 12 to 36 V, taken from the automatic door unit as AC or DC 24 V, with a DC 12 V supply as the alternative, connecting to terminals 1 and 4. Running it from the door unit lets it survive a power cut without losing its learned codes.
Three current figures define the load. Static power is 35 mA, action current is 85 mA for a non-current electric lock, and the electric lock output is rated at 3 A at 12 V through a high-current output module. The sizing rule is explicit: the output current of the DC regulator must exceed the action current of the lock, the point most often missed when a controller is specified on standby consumption alone.
The interval between unlocking the door and starting it is 0.5 seconds, and the delay is deliberate. Releasing a lock and commanding the leaf to move at the same instant means the motor fights a lock still dissipating its stored energy, which is how a noisy gear and a failed lock output happen. A built-in surge absorber handles the other half of the problem, because an electric lock is an inductive load and the return spark when it releases destroys unprotected output stages.
How to write the integration line on a purchase order
Access control integration goes wrong on paper long before it goes wrong on site. The specification for this part of a door should name seven things in writing.
- Where the credential sits: the access controller relay output terminating at the extender input, with the extender between controller and operator.
- The input type, written as passive contact or PUSH rather than a generic trigger request.
- The mode behaviour at each key and selector position, including the access control device.
- The power source and lock current, so the regulator is sized against the action current and 3 A rating, not standby draw.
- The timing, including the lock-to-door interval and the hold-open time.
- The transmitter quantity, checked against the sixteen-code limit before the handset count is fixed.
- The standards that apply to the operator and the radio. The operator is covered by UL 325 for automatically controlled doors and gates in the United States and by EN 16005 for power operated pedestrian doorsets in Europe.
Item three removes the most expensive class of complaint. If the mode behaviour is written down, a handset left on the wrong key is a deliberate choice. If it is not, it is a defect that appears on a Monday morning with nobody able to say what the door was doing on Saturday night.
Ask us about card reader and remote integration
If you are specifying the access control side of an automatic sliding door, send us the opening width, the leaf mass, the target market, the credential devices and the operating modes you need. We will come back with a component list, the published specifications behind each part, and any integration gap we can identify before you order.
send us your door specs or browse the automatic door accessories range.
Frequently Asked Questions
Can a card reader and a remote be used on the same automatic door?
Yes, and they are normally used together on a door with an M-203E extender. The card reader produces a momentary request through the access controller, and the remote selects the operating mode. Because they act on different layers, a remote in full lock or full open invalidates the access control device.
What is the difference between a passive contact input and a PUSH input on the receiver?
A passive contact input expects a voltage-free relay pair that closes to make the contact, which is the standard access controller output. A PUSH input is a direct momentary contact for a simple button rather than a controller. Neither is a powered 12 V or 24 V output, which should not be connected to that terminal.
How many remote transmitters can one M-203E receiver hold?
Up to sixteen transmitter codes can be learned into one receiver. Learning takes one second and deleting takes five, and deletion removes all codes at once rather than a single code, so handsets per receiver should be fixed before handover.
What happens to the card reader when the door is put into full lock?
The published behaviour for full lock is that all sensors are invalid and the electric lock is locked automatically, with the door held closed. The access control device is not consulted in that state, so a valid card will not open the door even though the system still records the swipe.
Do card readers and remotes have to be the same brand as the door operator?
No. The interface between the access controller and the door is a standard relay and trigger arrangement, so the card reader and controller can come from a different supplier, provided the output type matches the input and the interface is specified in writing before ordering.
About the author
Edison is Sales Manager at Ningbo Yufan Beifan Automatic Door Co., Ltd., a manufacturer of automatic door systems including sliding door operators, 24V brushless DC door motors and accessories.
Ningbo Yufan Beifan Automatic Door Co., Ltd. specializes in automatic door system R&D and manufacturing. Core products include automatic sliding door operators, 24V brushless DC door motors, and accessories, widely used in commercial buildings, public facilities, and industrial sites. Edison manages global project inquiries and OEM/ODM custom solutions, supporting distributors and project procurement clients worldwide.
For a specific automatic door project, contact Edison and the Ningbo Yufan Beifan team with the clear opening width, the leaf mass, the target market and the operating modes you need.
References cited in this article: UL 325, EN 16005 and 47 CFR Part 15.
Related reading from YFBF
- The sensors, mode accessories and remote controllers here are listed in the automatic door accessories range.
- The remote controller specifications and learning sequence are on the M-203E remote controller product page, and the five-position mode unit on the five-key function selector product page.
Last verified: 2026-11-05 · Accessory specifications reviewed against manufacturer product documentation on 5 November 2026.
Post time: Nov-05-2026