Kingdom-tech is one of the most professional suppliers for worldwide customers. We provide branded LTE modules,WCDMA modules,GSM modules,GNSS modules,NB-IoT modules and Wifi modules. We offer fast delivery, high quality, and we are very cooperative and friendly.
BSJ-Link BC25 is a price-performance GSM module,it can pin to pin Simcom800C,we provide BSJ-Link BC25 OEM if you need.
-40℃ to +85℃
One in one out
Q.1. What's your advantages?
Q.2.Do you have the MOQ?
-No MOQ is required.
Q.3.How is seller service?
If you do not receive the commodity within 60 days, you can ask for a full refund before order completion .
Q.4.How is return policy?
If the product you received is not as described or low quality, we promises that you can return it before order completion and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and ask for the negotiable refund from the seller.
Q.5: Are your products original?
Yes, our products are 100% original.
Q.6:SIM card cannot be recognized after the module works for a while.
Description: module responds +CPIN: READY after powering on, but after a while, it responds +CPIN: NOT READY. You can analyze the issue from the following aspects.
1) RF interference
a. You can use AT+CFUN=4,1 to disable the RF function and check if the issue still exists.
b. Put the antenna close to the SIM card and SIM card signal line to check if the issue appears more frequently.
c. Please check if there is electrical/magnetic field around the testing field, for example, high voltage transmission lines, high-power wireless devices, etc. Try to use shielding case to cover the SIM card and all the SIM signal lines to confirm if the issue will be resolved.
d. Try to connect the pins of SIM card signal (SIM_DATA/SIM_CLK/SIM_RST/SIM_VDD) to ground via 15~33PF capacitors to eliminate the RF interference.
2) Hardware design issue
If the VBAT trace is too close to the SIM card signal line, module can still recognize the SIM card because of the low ripple of VBAT when powering on. But when module starts to register to the network, the ripple will become higher and interfere the SIM card signal line, which might cause the module not to recognize the SIM card. You can cut off the power supplied to the module and use external power source to directly feed to VBAT pin of module to see if the issue is resolved.
3) Poor quality of SIM card
a. Change another SIM card to see if there is the same problem on the new SIM card.
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