KC868-A8M SIM7600 GPRS Disconnected

[deepthasm]

Hi,
Recently I bought KC868-A8M with SIM7600 module and Installed the latest KCS firmware (KCS_KC868_A8M_V2.1.9). I enabled the GSM on the network settings page. But, I'm getting "GPRS : disconnected" on monitor page. Try to clicking "Phone test" but I'm getting "error".

Following are the logs for reference.

[1B][0;32mI (2958) phy_init: phy_version 4670,719f9f6,Feb 18 2021,17:07:07[1B][0m
I (3046) wifi:mode : softAP (08:f9:e0:8a:ee:29)
I (3047) wifi:Total power save buffer number: 16
I (3047) wifi:Init max length of beacon: 752/752
I (3049) wifi:Init max length of beacon: 752/752
[1B][0;32mI (3054) web_server: Starting HTTP Server on port: '80'[1B][0m
[1B][0;32mI (3061) gpio: GPIO[0]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 1| Intr:0 [1B][0m
[1B][0;32mI (3069) ntp: tz:UTC+0[1B][0m
[1B][0;32mI (3069) UDP SERVER: Socket created[1B][0m
[1B][0;32mI (3075) UDP SERVER: Socket bound, port 4001[1B][0m
[1B][0;32mI (3069) RF: RCSwitch->nReceiverInterrupt=16 gpio_pin_sel=65536[1B][0m
[1B][0;32mI (3087) gpio: GPIO[16]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3 [1B][0m
[1B][0;32mI (3097) RF: Start RF receiver[1B][0m
[1B][0;32mI (3097) uart: queue free spaces: 20[1B][0m
[1B][0;32mI (3104) gprs: gprs init success.[1B][0m
[1B][0;32mI (3115) pcf857x: pcf857x init.[1B][0m
eFuse Two Point: NOT supported
eFuse Vref: Supported
[1B][0;32mI (3117) analog: ---->adc1 thresholdd : 0[1B][0m

So on, 

I checked SIM7600 module connecting directly to the Computer using USB. Module is working perfectly and can send and receive both SMS and Voice call.


Please help.

[admin]

after you enable "GSM", MUST reboot then can use test GSM function. do you have reboot? just power off->on of your board.

[deepthasm]

after you enable "GSM", MUST reboot then can use test GSM function. do you have reboot? just power off->on of your board.

Yes, I did. The same error occurs.

[admin]

if your mobile phone voice call sim card (SIM7600), whether normal?

[deepthasm]

Yes. Green LED working. Receiving SMS and calls. Do I need a specifically configure SIM7600 ?

[admin]

we are checking now.

[admin]

do you want only use by 4G module, not need to use RS485 , right?
because RS485 and 4G module use same serial port. if you not need to use RS485, you need remove IC:U26 (74LVC1G125) . Then you can use 4G module.
we have update KCS A8M firmware for V2.2.4 to solve the 4G module problem. just download it directly to use.

  KCS_KC868_A8M_V2.2.4.zip (Size: 764.48 KB / Downloads: 59)

[deepthasm]

do you want only use by 4G module, not need to use RS485 , right?
because RS485 and 4G module use same serial port. if you not need to use RS485, you need remove IC:U26 (74LVC1G125) . Then you can use 4G module.
we have update KCS A8M firmware for V2.2.4 to solve the 4G module problem. just download it directly to use.

Thank you very much for your quick response and support. I purchase several SHT20 RS485 Modbus modules to get samples from several places. Anyway, I will use an alternative.

[deepthasm]

Just remove the U26 IC and upload the given firmware. But have the same error.



[1B][0;32mI (3248) gpio: GPIO[16]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3 [1B][0m
[1B][0;32mI (3258) RF: Start RF receiver[1B][0m
[1B][0;32mI (3265) pcf857x: pcf857x init.[1B][0m
eFuse Two Point: NOT supported
eFuse Vref: Supported
[1B][0;32mI (3270) analog: ---->adc1 thresholdd : 0[1B][0m


Do I need to do any changes...?

[admin]

we have tested A8M remove U26 chip by KCS v2.2.4 firmware . it's OK.  Note: after you enable GSM, press SAVE button. then you need power off->on of your A8M board. when power on again, then use "Phone test" button to test "SMS" or "CALL".
   
   
   
test with CALL
   
test with SMS