# Trying to read From UART2 **URL:** \ **Category:** General\ **Created:** [May 26, 2006, 8:51pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478 "2006-05-26T20:51:58Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![sanabiovilela](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sanabiovilela](https://forum.sierrawireless.com/u/sanabiovilela)\ **Post date:** [May 26, 2006, 8:51pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/1 "2006-05-26T20:51:58Z")
Hello everyone! I´m using 2406 and 2501 modules and I´m trying to read strings from an external GPS. This external GPS works with 4800bps. I´ll need the UART1 to enter AT commands and Read status messages with Hyperterminal. But still then I couldn´t read it… Can anybody help me? Here´s my code: ```auto adl_atCmdCreate("AT+WGPSCONF=0,0",FALSE,(adl_atRspHandler_t)NULL,NULL); adl_atCmdCreate("AT+WMFM=0,1,2",FALSE,(adl_atRspHandler_t)NULL,NULL); adl_atCmdCreate( "AT+IPR=4800", ADL_AT_PORT_TYPE( ADL_AT_UART2, FALSE ), Res_IPR_Handler, "*", NULL ); bool SerialControl(adl_fcmEvent_e event) { switch(event) { case ADL_FCM_EVENT_FLOW_OPENNED: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_FLOW_CLOSED: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_DATA_MODE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_DATA_MODE_EXT: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_AT_MODE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_AT_MODE_EXT: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_RESUME: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_MEM_RELEASE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; } } bool SerialData(u16 DataLen, u8 * Data) { adl_atSendResponse(ADL_AT_RSP, "\r\nReceived Data\r\n"); return FALSE; } bool Res_IPR_Handler( adl_atResponse_t *paras ) { adl_atSendResponse(ADL_AT_RSP, "\r\nRs_IPR_Handler\r\n"); adl_fcmSubscribe( ADL_FCM_FLOW_V24_UART2, SerialControl, SerialData ); return TRUE; } ``` The first thing I´m trying to do Is get any “Received Data” message. Any ideas? Thanks, Henrique [rickonvb@yahoo.com.br](mailto:rickonvb@yahoo.com.br) [/code] ---
**Author:** ![tomalex](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tomalex](https://forum.sierrawireless.com/u/tomalex)\ **Post date:** [May 27, 2006, 12:39pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/2 "2006-05-27T12:39:30Z")
Hello, I used to manage the uarts this way: - setup: 1. Issue the AT+WMFM command. 2. Wait until the WMFM response handle receive the “OK” 3. config the uart wiht AT+IPR (speed) and AT+ICF(parity, stop bit…) 4. save with AT&W (you don’t have to set at every restart) (Make sure that the GPS uart settings matches the wismo settings) -to use: 1. Open the flow ```auto UART_Handler = adl_fcmSubscribe (ADL_FCM_FLOW_V24_UARTX, UART_ControlHandler, UART_DataHandler ); ``` 1. in the UART\_ControlHandler after the ADL\_FCM\_EVENT\_FLOW\_OPENED received switch to data mode, if reading data streams needed like GPS sentences ```auto adl_fcmSwitchV24State(UART_Handler,ADL_FCM_V24_STATE_DATA) ``` (Always check the return value of the functions) Best Regards, tom ---
**Author:** ![sanabiovilela](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sanabiovilela](https://forum.sierrawireless.com/u/sanabiovilela)\ **Post date:** [May 29, 2006, 7:59pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/3 "2006-05-29T19:59:55Z")
Here´s the thing: I´m testing the code with a 2501Q Module, ok? I want to use the UART1 to display information and enter AT commands. I also want to use UART2 with an External GPS. So I used the AT+WGPSCONF command to disable GSM control over UART2. When I enter “AT+WGPSCONF?” I get: “AT+WGPSCONF= 0,0,0” I powered the GPS down too with “AT+WGPSM=0,0” Now the code is: ```auto At adl_main: adl_atCmdCreate("AT+WMFM=0,1,2",FALSE,(adl_atRspHandler_t)NULL,NULL); adl_atCmdCreate( "AT+IPR=4800", ADL_AT_PORT_TYPE( ADL_AT_UART2, FALSE ), Res_IPR_Handler, "*", NULL ); ``` And the functions: ```auto bool SerialControl(adl_fcmEvent_e event) { s8 Ret; ascii buffer[40]; switch(event) { case ADL_FCM_EVENT_FLOW_OPENNED: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); Ret = adl_fcmSwitchV24State(UART2_Handler,ADL_FCM_V24_STATE_DATA); wm_sprintf(buffer, "\r\nRet Switch: %d\r\n", Ret); adl_atSendResponse(ADL_AT_RSP, buffer); break; case ADL_FCM_EVENT_FLOW_CLOSED: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_DATA_MODE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_DATA_MODE_EXT: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_AT_MODE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_V24_AT_MODE_EXT: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_RESUME: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; case ADL_FCM_EVENT_MEM_RELEASE: adl_atSendResponse(ADL_AT_RSP, "\r\nADL_FCM_EVENT_FLOW_OPENNED\r\n"); break; } } bool SerialData(u16 DataLen, u8 * Data) { adl_atSendResponse(ADL_AT_RSP, "\r\nReceived Data\r\n"); return FALSE; } bool Res_IPR_Handler( adl_atResponse_t *paras ) { adl_atSendResponse(ADL_AT_RSP, "\r\nRs_IPR_Handler\r\n"); UART2_Handler = adl_fcmSubscribe( ADL_FCM_FLOW_V24_UART2, SerialControl, SerialData ); return TRUE; } ``` Every function called returns OK results. The GPS I´m trying to connect to UART2 is a U-BLOX (RX, TX, GND). But I never get any response… Before trying the command “AT+WGPSM=0,0”, just using the “AT+WGPSCONF=0,0” the internal GPS was still polling data from the UART2. Is it normal? I need the UART clear and free to enter with data from my new GPS. Anybody? Any Ideas? Any ideas Tom? Thanks! BEst Regards, Henrique [rickonvb@yahoo.com.br](mailto:rickonvb@yahoo.com.br) ---
**Author:** ![tomalex](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tomalex](https://forum.sierrawireless.com/u/tomalex)\ **Post date:** [May 29, 2006, 8:43pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/4 "2006-05-29T20:43:54Z")
Hello sanabiovilela! Have you connected your external GPS to GSM\_TXD2 (GPI- Pin 38 ) and GSM\_RXD2 (GPO2 - Pin 40) ? The GPS\_TXD2, GPS\_RXD2, GPS\_TXD0,GPS\_RXD0 pins are only usable for external communication with the internal GPS receiver. In default GPS configuration GPS\_RXD2 outputs NMEA frames. Best Regards, Tom ---
**Author:** ![sanabiovilela](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@sanabiovilela](https://forum.sierrawireless.com/u/sanabiovilela)\ **Post date:** [May 30, 2006, 5:26pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/5 "2006-05-30T17:26:31Z")
I´m using a Development Kit from Wavecom. The board has a DB9 connector which is connected to a Converter (I think it is a converter). This converter has a PIN called T2IN which is connected to GPS\_RXD2 and another PIN called R2OUT which is connected to GPS\_TXD2. This “converter” has another 2 pins called T2OUT and R2IN which are connected to pins 2 and 3 of my DB9 connector. This electronic schem can be found on “Wismo Quik Q2501 Customer Design Guidelines”. So… I think my external GPS is connected correctly. Is everything I did ok? Is it supposed to be already running as I said? Thanks! Best Regards, Henrique [rickonvb@yahoo.com.br](mailto:rickonvb@yahoo.com.br) ---
**Author:** ![tomalex](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tomalex](https://forum.sierrawireless.com/u/tomalex)\ **Post date:** [May 30, 2006, 8:14pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/6 "2006-05-30T20:14:05Z")
Hello, You have connected to the wrong pins. GPS\_TXD2, GPS\_RXD2, (GPS\_TXD0,GPS\_RXD0) only usable with the internal GPS. If you want to use UART2 from Open AT with the starter kit, you have to connect to the J200 connector’s pins. GSM\_TXD2 is pin 38, GSM\_RXD2 is pin 45. These pins are at CMOS level. Best regards, tom ---
**Author:** ![atcaeiro](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@atcaeiro](https://forum.sierrawireless.com/u/atcaeiro)\ **Post date:** [September 1, 2006, 10:14am UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/7 "2006-09-01T10:14:59Z")
Hello, I’m working with Q2686H and I’ve the same problem. I’m trying to read data from an external GPS (Falcom) connected to UART2 but I don`t receive anything. The UART2 connection is well done (I’ve received data from a hyperterminal) and I’m using a Development Kit from Wavecom so it could not be a PIN problem. Any ideas?? Thanks, Alex. ---
**Author:** ![tomalex](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tomalex](https://forum.sierrawireless.com/u/tomalex)\ **Post date:** [September 1, 2006, 11:28am UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/8 "2006-09-01T11:28:37Z")
Hello, Please post your 2686 firmware version and do the steps which i wrote above in this topic and write down the answers for at commands and functions. Best Regards, tom ---
**Author:** ![atcaeiro](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@atcaeiro](https://forum.sierrawireless.com/u/atcaeiro)\ **Post date:** [September 4, 2006, 8:10am UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/9 "2006-09-04T08:10:35Z")
Hello, My 2686 firmware version is: a09\_0ggg.Q2686H 0026016CAE5DC7FF I did the steps which you wrote (the UART2 was already opened) and the answer of the commands are: ``` Trace CUS4 1 Embedded : Appli Init Trace CUS4 1 Iniciamos SETUP puerto 2 Trace CUS4 1 Inside FCM Control Handler = 0 Trace CUS4 1 FCM_FLOW_OPENNED Trace CUS4 1 Switch to data : 0 Trace CUS4 1 Inside FCM Control Handler = 2 Trace CUS4 1 ADL_FCM_EVENT_V24_DATA_MODE ``` After it, the dataHandler function is not ever called. (But if I disconnect the GPS and I connect the hyperterminal to the port 2, I can send and receive data). Best Regards, Alex. ---
**Author:** ![tomalex](https://avatars.discourse-cdn.com/v4/letter/t/71e660/32.png) [@tomalex](https://forum.sierrawireless.com/u/tomalex)\ **Post date:** [September 4, 2006, 8:13pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/10 "2006-09-04T20:13:36Z")
Hello atceoiro, Please try to use the module with the final version of OS 6.60. (and with the final OAT 4.00) I faintly remember that in the early versions the UART2 was not implemented. If you use a starter kit do not forget to turn on the RS232 if needed. 😉 Best Regards, tom ---
**Author:** ![atcaeiro](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@atcaeiro](https://forum.sierrawireless.com/u/atcaeiro)\ **Post date:** [September 8, 2006, 7:31am UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/11 "2006-09-08T07:31:48Z")
Hello tom, Thanks for your reply. It is working now with the same firmware. You wrote the answer in an old post. It was a pin connection problem, so if I use a mini adapter between GPS module and UART2 it works fine. Best Regards, Alex. ---
**Author:** ![bkampers](https://avatars.discourse-cdn.com/v4/letter/b/f19dbf/32.png) [@bkampers](https://forum.sierrawireless.com/u/bkampers)\ **Post date:** [October 24, 2006, 3:23pm UTC](https://forum.sierrawireless.com/t/trying-to-read-from-uart2/478/12 "2006-10-24T15:23:28Z")
Hello all, I did exactly as quoted below on a Q2406B board. I connected the UART2 to my PC’s com port through a MAX233 IC. All I see in Hyper Terminal is garbage. No events occur when I type text in the terminal. When I do not change the baud rate (I assume it stays on 115200) I see texts in the terminal that slightly look like the ones I sent but a lot of characters are damaged Anyone any idea? > [@tomalex](#): > > - setup: > > 1. Issue the AT+WMFM command. > 2. Wait until the WMFM response handle receive the “OK” > 3. config the uart wiht AT+IPR (speed) and AT+ICF(parity, stop bit…) > 4. save with AT&W (you don’t have to set at every restart) > > (Make sure that the GPS uart settings matches the wismo settings) > > -to use: > > 1. Open the flow > > ```auto > UART_Handler = adl_fcmSubscribe (ADL_FCM_FLOW_V24_UARTX, UART_ControlHandler, UART_DataHandler ); > ``` > > 1. in the UART\_ControlHandler after the ADL\_FCM\_EVENT\_FLOW\_OPENED received switch to data mode, if reading data streams needed like GPS sentences > > ```auto > adl_fcmSwitchV24State(UART_Handler,ADL_FCM_V24_STATE_DATA) > ``` > > (Always check the return value of the functions) Kind regards, Bart.