Short answer
RFID, a password and a remote command are not three grades of convenience. A card can be lost or handed over, a password can be shared and never rotated, and a remote command needs coverage the moment you need it. Choose by which of those three failures your operation can absorb.
Key takeaways
- The JT701 lists three unlock methods, RFID card, password and remote command, and each fails in a different way.
- The JT709ex lists Bluetooth, RFID and a mechanical key for emergencies, so its last resort is physical rather than digital.
- Only the remote command depends on the network; only it also produces a platform-side record of who authorised the opening.
- A mechanical key is the method that always works and is also the one you can least audit, which is why its use is published as its own alert type.
- The right design usually carries two methods with different failure modes, not two that fail together.
01What each device actually offers
The two locks in our catalogue publish different unlock lists, and the difference is not arbitrary. The JT701 master lists RFID card, password and remote command. The JT709ex field lock lists Bluetooth, RFID and a mechanical key described as an emergency method. Only the master offers a remote command, which follows directly from it being the only device in the pair with a cellular connection, its GSM and 3G link on dual SIM is what a platform command travels over. The field lock has no cellular radio of its own, so its remote unlock is listed as performed via the JT701 master on the platform. And only the field lock offers a mechanical key, because it is the device intended to sit on a valve where a person may need in without any working electronics at all.
02How an RFID card fails
An RFID card is a physical token, and it inherits every property of a physical object. It works with no network, which is its strength: a driver at a remote loading bay can open a lock with a card whether or not there is coverage. But a card can be left at home, dropped in a yard, damaged, or lent to a colleague for a shift and never returned. The failure that matters most is not loss but transfer, because a card in someone else's hand still authenticates perfectly, the lock has no way to tell who is holding it. So an RFID deployment is really an inventory problem: the security of the fleet is the security of the card register, and a card that is not promptly revoked when a driver leaves is a permanent open door.
03How a password fails
A password is the method that needs nothing at all, no card, no phone, no coverage. That makes it the most reliable to use and the hardest to control. A password cannot be lost, which sounds like an advantage until you notice the corollary: it also cannot be returned. Once a code is known to a driver it stays known, and it spreads by exactly the mechanism that makes it convenient, which is that one person can tell another in a sentence. The practical consequence is that a shared code drifts from being a credential to being common knowledge, and the only remedy is rotation. An operation that issues one code and never changes it has not deployed access control; it has deployed a mildly inconvenient door, and every former employee still has a key.
04How a remote command fails
A remote command is the only method where the person who authorises the opening and the person standing at the lock are two different people, and that is its main security value. Nobody at the trailer holds a credential at all. The cost is a dependency chain: the command has to reach the JT701 over GSM or 3G, and for a field lock it then has to travel on to the JT709ex over Bluetooth or LoRa, which is published as reaching up to 1 km in open area. Any break in that chain, no coverage, a flat master, a lock parked beyond link range, and the command does not arrive. Dual SIM narrows the coverage risk by letting the master use either of two carriers, but it does not remove the dependency. Remote unlock is the strongest method when it works and the only one that cannot work at all when the network is down.
05The mechanical key, and why its use is an alert
The JT709ex carries a mechanical key listed explicitly as an emergency method, and it deserves a section of its own because it is the one method that always works. A dead battery, a failed radio, a lost card and a network outage all leave it functioning. That reliability is exactly why it is the hardest method to govern: a physical key needs no authentication, produces no credential, and cannot be revoked from a platform. Our catalogue handles that tension in a specific way, mechanical key used is published as one of the lock's own alert types, alongside tamper and shackle cut. The key is not prevented; its use is announced. That is the correct design for a last resort, because the goal is not to stop the emergency opening but to make sure it is never a silent one.
06What each method leaves behind
There is a second axis besides reliability, and it is the one buyers usually skip: what evidence each method produces. A remote command is authorised inside the platform, so the record of who opened the lock exists independently of the lock itself. An RFID card identifies the card, which is a weaker claim than identifying the person, but still a claim. A password identifies nothing beyond the fact that someone knew the code. A mechanical key identifies nothing at all, which is why its use is surfaced as an alert rather than as an identity. If the operation needs to answer the question "who opened this compartment" months later, that ranking matters more than convenience, because a method that opens reliably and records nothing will fail the investigation rather than the delivery.
07Choosing a combination rather than a winner
The useful conclusion is that no single method wins, and that the common mistake is picking two methods that fail for the same reason. A password plus a remote command still leaves the operation stuck if the network is down and nobody remembers the code, because both depend on something being remembered or delivered. A card plus a remote command is a better pair, since one works offline and the other works without anyone holding a credential. Then decide the last resort deliberately: on a field lock the mechanical key is that resort, and the discipline that makes it acceptable is that its use raises an alert and someone actually reads it. Write down which failure each method covers before ordering, and the shape of the right combination becomes obvious.
| Method | Needs a network? | How it fails | What it records |
|---|---|---|---|
| RFID card | No | Lost, damaged, or handed to someone else | The card, not the person |
| Password | No | Shared, then never rotated | That someone knew the code |
| Remote command | Yes | No coverage, flat master, out of link range | Who authorised it, in the platform |
| Bluetooth (field lock) | No | Phone unavailable or out of range | The paired phone |
| Mechanical key | No | Effectively never, that is the problem | Nothing; its use raises an alert |
Figures and sources
- Jointech JT701 unlock methods: RFID card, password, remote command (Source: ENTEK.AI product specification, Jointech JT701, as of 2026-08-31)
- Jointech JT709ex unlock methods, including the emergency override: Bluetooth, RFID, mechanical key (emergency) (Source: ENTEK.AI product specification, Jointech JT709ex, as of 2026-08-31)
- Jointech JT701 cellular connectivity, which the remote command depends on: GSM / 3G, dual SIM (Source: ENTEK.AI product specification, Jointech JT701, as of 2026-08-31)
- Where a JT709ex remote unlock is performed from: via the JT701 master on the platform (Source: ENTEK.AI product catalogue, as of 2026-08-31)
- Jointech JT709ex link to its master, and range: Bluetooth / LoRa, up to 1 km (open area) (Source: ENTEK.AI product specification, Jointech JT709ex, as of 2026-08-31)
- Jointech JT709ex alert types, one of which reports the emergency key: tamper, mechanical key used, shackle cut (Source: ENTEK.AI product specification, Jointech JT709ex, as of 2026-08-31)
- Jointech JT709ex own cellular capability, which is why it has no remote command of its own: none, via master (Source: ENTEK.AI product specification, Jointech JT709ex, as of 2026-08-31)
- Jointech JT701 alert types published, for the record an unlock is judged against: rope cut, back cover, geo-fence, battery low (Source: ENTEK.AI product specification, Jointech JT701, as of 2026-08-31)
Questions
Which unlock method is the most secure?
The remote command, because nobody at the trailer holds a credential and the authorisation is recorded in the platform. It is also the only method that stops working entirely when there is no coverage, so it should never be the only method on a lock.
Why does the field lock have a mechanical key at all?
Because it is the only method that survives a dead battery, a failed radio and a network outage together. Our catalogue lists it as an emergency method and publishes mechanical key used as its own alert type, the key is not prevented, its use is announced.
Is a shared password acceptable for a fleet?
Only with rotation. A password cannot be lost, but it also cannot be returned: once a driver knows a code it stays known and spreads easily. Without a rotation schedule, every former employee still holds working access.
What combination of methods should I specify?
Two methods that fail for different reasons. A card plus a remote command is a good pair, one works offline, the other needs no credential at the trailer. A password plus a remote command is a weaker pair, because both depend on something being remembered or delivered.