# Knowledge Base **URL:** https://forum.sierrawireless.com/c/knowledge-base/6.md?page=5 [Latest](https://forum.sierrawireless.com/latest.md) · [Categories](https://forum.sierrawireless.com/categories.md) · [Tags](https://forum.sierrawireless.com/tags.md) **Page:** 6 --- ## [\[Hilo\] Does the UART works in FULL-DUPLEX or HALF-DUPLEX?](https://forum.sierrawireless.com/t/hilo-does-the-uart-works-in-full-duplex-or-half-duplex/6500)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:30am UTC](https://forum.sierrawireless.com/t/hilo-does-the-uart-works-in-full-duplex-or-half-duplex/6500 "2013-07-19T06:30:46Z")
Answer: The HiloV2 is FULL-DUPLEX, whatever in command mode or data mode. Between AT command on RXD) and the answer on TXD, it is possible (but quite rare) that you get an URC on TXD. If you want to disable URC, you ca… --- ## [\[Hilo\] In MUX all the URC will be broadcast to all channels?](https://forum.sierrawireless.com/t/hilo-in-mux-all-the-urc-will-be-broadcast-to-all-channels/6499)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:29am UTC](https://forum.sierrawireless.com/t/hilo-in-mux-all-the-urc-will-be-broadcast-to-all-channels/6499 "2013-07-19T06:29:20Z")
\[Hilo\] In MUX mode, the notification (URC) of UDP will be broadcast to all channels or only occurs in the same channel? Answer: No. URC of UDP will not be broadcasted to al MUX channels, but only occurs in the same work… --- ## [\[Hilo\] Could GPIO config for +KGSMSD be saved after reboot?](https://forum.sierrawireless.com/t/hilo-could-gpio-config-for-kgsmsd-be-saved-after-reboot/6498)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:26am UTC](https://forum.sierrawireless.com/t/hilo-could-gpio-config-for-kgsmsd-be-saved-after-reboot/6498 "2013-07-19T06:26:37Z")
\[Hilo\] Do I need to set GPIO (AT+KGPIOCFG) before antenna detection \? Answer: No. When you want to use antenna detection feature, you don’t need to set GPIO by yourself. When you set \ **Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:24am UTC](https://forum.sierrawireless.com/t/hilo-is-it-possible-keep-dcd-in-off-when-sending-sms/6497 "2013-07-19T06:24:21Z") \[Hilo\] Is it possible keep DCD signal in OFF(inactive) status when sending a SMS? Can \ work for that? Answer: No. Hilo respects TS 27.005 definition, so: The DCD signal shall be in ON state while text is entere… --- ## [\[Hilo\] How to manage the PIN code of SIM card?](https://forum.sierrawireless.com/t/hilo-how-to-manage-the-pin-code-of-sim-card/6496)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:18am UTC](https://forum.sierrawireless.com/t/hilo-how-to-manage-the-pin-code-of-sim-card/6496 "2013-07-19T06:18:00Z")
Answer: Please see the following examples: Example about PIN and PUK: AT+CLCK=“SC”,1,“0000”,1 ----\>When you want to set pin code “0000” OK –Reboot module AT+CPIN? +CPIN: SIM PIN OK AT+CPIN=“0000” OK AT+CPWD=“SC… --- ## [\[Hilo\] H/W flow control (CTS and RTS signals)](https://forum.sierrawireless.com/t/hilo-h-w-flow-control-cts-and-rts-signals/6495)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:17am UTC](https://forum.sierrawireless.com/t/hilo-h-w-flow-control-cts-and-rts-signals/6495 "2013-07-19T06:17:11Z")
\[Hilo\] H/W flow control (CTS and RTS signals) Q1: Should CTS be active (low electrical level) as long as modem is ready to receive data? Answer: Yes. Q2: What is the required value for RTS to have an answer from modem… --- ## [\[Hilo\] What’s the probability after asking \?](https://forum.sierrawireless.com/t/hilo-what-s-the-probability-after-asking-at-kbnd/6494)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:16am UTC](https://forum.sierrawireless.com/t/hilo-what-s-the-probability-after-asking-at-kbnd/6494 "2013-07-19T06:16:38Z")
\[Hilo\] What’s the probability after asking \? Will the result change after connection? Answer: This command indicates the current band in use. After the connection, the result may change even you did not move … --- ## [\[Hilo\] Can I use Hilo3G as TCP/FTP server?](https://forum.sierrawireless.com/t/hilo-can-i-use-hilo3g-as-tcp-ftp-server/6493)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:14am UTC](https://forum.sierrawireless.com/t/hilo-can-i-use-hilo3g-as-tcp-ftp-server/6493 "2013-07-19T06:14:19Z")
Answer: No. HiLo3G only supports client mode; sever mode is not supported. --- ## [\[Hilo\] Could you provide Linux sample code for MUX?](https://forum.sierrawireless.com/t/hilo-could-you-provide-linux-sample-code-for-mux/6492)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 19, 2013, 6:13am UTC](https://forum.sierrawireless.com/t/hilo-could-you-provide-linux-sample-code-for-mux/6492 "2013-07-19T06:13:39Z")
Answer: Yes you can download it from developer.sierrawireless.com/en/ … urces.aspx --- ## [\[Hilo\]what other service can be handled during a voice call?](https://forum.sierrawireless.com/t/hilo-what-other-service-can-be-handled-during-a-voice-call/6486)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:54am UTC](https://forum.sierrawireless.com/t/hilo-what-other-service-can-be-handled-during-a-voice-call/6486 "2013-07-18T08:54:25Z")
Answer: Since GPRS “Class B” of the Hilo2G module, so: During analog VOICE call, module cannot send an Email at the same time. During analog VOICE call, module can send out a SMS which is over GSM. During analog VOICE… --- ## [\[Hilo\] Can TCP and SMTP service work at the same time?](https://forum.sierrawireless.com/t/hilo-can-tcp-and-smtp-service-work-at-the-same-time/6485)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:51am UTC](https://forum.sierrawireless.com/t/hilo-can-tcp-and-smtp-service-work-at-the-same-time/6485 "2013-07-18T08:51:42Z")
Answer: Yes. AT+KSMTP and AT+KPOP can work while TCP or UDP is active. The only limitation is 8 sockets in module can be used. And different error code (URC) would be used for different service, so no mix for them. Fo… --- ## [\[Hilo\] What’s the way to exit data mode when no DTR connecti](https://forum.sierrawireless.com/t/hilo-what-s-the-way-to-exit-data-mode-when-no-dtr-connecti/6484)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:48am UTC](https://forum.sierrawireless.com/t/hilo-what-s-the-way-to-exit-data-mode-when-no-dtr-connecti/6484 "2013-07-18T08:48:59Z")
Answer: 1) Using “+++” to suspend the connection 2) Using “–EOF–Pattern–” when in TCP/UDP/FTP/ service. --- ## [\[Hilo\] Any limitation of FTP file size?](https://forum.sierrawireless.com/t/hilo-any-limitation-of-ftp-file-size/6483)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:48am UTC](https://forum.sierrawireless.com/t/hilo-any-limitation-of-ftp-file-size/6483 "2013-07-18T08:48:11Z")
\[Hilo\] Any limitation of file size when Upload and Download file via FTP by Hilo? Answer: When upload from flash file, no limitation since the file is already existed in flash. When download and save the data in flash … --- ## [\[Hilo\] How to avoid data missing when upload big data?](https://forum.sierrawireless.com/t/hilo-how-to-avoid-data-missing-when-upload-big-data/6482)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:46am UTC](https://forum.sierrawireless.com/t/hilo-how-to-avoid-data-missing-when-upload-big-data/6482 "2013-07-18T08:46:21Z")
\[Hilo\] How to avoid data missing when using FTP(AT+KFTPSND) to upload big data? Answer: Please use flow control when sending big number of data: AT&K3 for software flow control. AT&K4 for hardware flow control. --- ## [\[Hilo\] Why it takes minutes to close the TCP session?](https://forum.sierrawireless.com/t/hilo-why-it-takes-minutes-to-close-the-tcp-session/6481)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:42am UTC](https://forum.sierrawireless.com/t/hilo-why-it-takes-minutes-to-close-the-tcp-session/6481 "2013-07-18T08:42:09Z")
\[Hilo\] Why sometimes it takes long time to close the TCP connection by \< AT+KTCPCLOSE=1,0\>? How to avoid that? Answer: From firmware HiloV2 5.04, you can use \ to have a quick close (“OK” will be return… --- ## [\[Hilo\] Why Automatic Call Answer(ATS0=2) not work in MUX?](https://forum.sierrawireless.com/t/hilo-why-automatic-call-answer-ats0-2-not-work-in-mux/6480)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 8:39am UTC](https://forum.sierrawireless.com/t/hilo-why-automatic-call-answer-ats0-2-not-work-in-mux/6480 "2013-07-18T08:39:13Z")
\[Hilo\] Why Automatic Call Answering (ATS0=2) not work in MUX with my Hilo? Answer: To make auto-answering work in MUX mode, you need to send \ in the first data channel that is opened. Below are 2 examples. If… --- ## [\[Hilo\] Can Hilo3G be used as modem to connect with internet?](https://forum.sierrawireless.com/t/hilo-can-hilo3g-be-used-as-modem-to-connect-with-internet/6479)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 7:10am UTC](https://forum.sierrawireless.com/t/hilo-can-hilo3g-be-used-as-modem-to-connect-with-internet/6479 "2013-07-18T07:10:20Z")
\[Hilo\] Can Hilo3G be used as a modem to connect to the internet with a PC? Answer: Yes. HiLo3G can be used as a USB modem. Here are the steps to use: Connect HiLo3G to a PC via USB cable. Install the USB driver then a… --- ## [\[Hilo\] What’s the best way to know the end of FTP download?](https://forum.sierrawireless.com/t/hilo-what-s-the-best-way-to-know-the-end-of-ftp-download/6478)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:56am UTC](https://forum.sierrawireless.com/t/hilo-what-s-the-best-way-to-know-the-end-of-ftp-download/6478 "2013-07-18T06:56:47Z")
Answer: When use KFTPRCV, If the 2 conditions below are matched, we can know that it’s the end of the file. \ is detected; DCD changes from ON to OFF. --- ## [\[Hilo\] Why no “OK” retuned for \ Hilo3G?](https://forum.sierrawireless.com/t/hilo-why-no-ok-retuned-for-at-knetscan-0-1-hilo3g/6477)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:54am UTC](https://forum.sierrawireless.com/t/hilo-why-no-ok-retuned-for-at-knetscan-0-1-hilo3g/6477 "2013-07-18T06:54:28Z")
Answer: When no SIM card inserted, no “OK” returned for \. --- ## [\[Hilo\] Why no respond for \ when in MUX?](https://forum.sierrawireless.com/t/hilo-why-no-respond-for-at-cpms-when-in-mux/6476)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:54am UTC](https://forum.sierrawireless.com/t/hilo-why-no-respond-for-at-cpms-when-in-mux/6476 "2013-07-18T06:54:06Z")
Answer: When AT\*PSSTKI is in mode 3, some actions will be performed automatically without user interaction and without sending URC to notify the user. After some time, it will cause the internal state to be busy, and it… --- ## [\[Hilo\] How to set AT+CMGS\ for PDU SMS?](https://forum.sierrawireless.com/t/hilo-how-to-set-at-cmgs-length-for-pdu-sms/6475)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:51am UTC](https://forum.sierrawireless.com/t/hilo-how-to-set-at-cmgs-length-for-pdu-sms/6475 "2013-07-18T06:51:06Z")
Answer: The formula to calculate the = PDU\_LENGTH - SMSC\_LEN. Also here’s an example: 1/ Details of the sample message SMSC: +8613800755500 Recipient: +861353815xxxx Alphabet: UCS2 (16bit) Data: 12345 PDU after e… --- ## [\[Hilo\] How many SMS the HILO can store?](https://forum.sierrawireless.com/t/hilo-how-many-sms-the-hilo-can-store/6474)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:48am UTC](https://forum.sierrawireless.com/t/hilo-how-many-sms-the-hilo-can-store/6474 "2013-07-18T06:48:07Z")
Answer: The HiLo can store up to 100 SMS in his flash memory. However, it can also store some SMS in the SIM card. You can choose your preferred memory by using: \< AT+CPMS=“SM”,“SM”,“SM” \> to select a storage in the SIM… --- ## [\[Hilo\] What is the maximum size of a MMS?](https://forum.sierrawireless.com/t/hilo-what-is-the-maximum-size-of-a-mms/6473)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:47am UTC](https://forum.sierrawireless.com/t/hilo-what-is-the-maximum-size-of-a-mms/6473 "2013-07-18T06:47:42Z")
Answer: The maximum size of a MMS is 300KB but a lot of operators have limited it less than 300KB. For example, a French operator limits the size of the MMS up to 100KB. So, to know the maximum size of a MMS, you have to… --- ## [\[Hilo\] why I always fail to connect it with a FTP client?](https://forum.sierrawireless.com/t/hilo-why-i-always-fail-to-connect-it-with-a-ftp-client/6472)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:47am UTC](https://forum.sierrawireless.com/t/hilo-why-i-always-fail-to-connect-it-with-a-ftp-client/6472 "2013-07-18T06:47:19Z")
\[Hilo\] When Hilo is used as a FTP server, why I always fail to connect it with a FTP client? Answer: The IP of the Hilo has to be routable and public one. If your Hilo has a private IP, it will be seen only by a PC on … --- ## [\[Hilo\] What settings are saved by AT&W in HiloV2?](https://forum.sierrawireless.com/t/hilo-what-settings-are-saved-by-at-w-in-hilov2/6471)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:46am UTC](https://forum.sierrawireless.com/t/hilo-what-settings-are-saved-by-at-w-in-hilov2/6471 "2013-07-18T06:46:25Z")
Answer: Please find the following configuration saved in flash: E: Echo Q: Set result code presentation mode V: Verbose X: Extended result code &C: DCD control &D: DTR behavior &R: RTS control &S0 DSR control &K… --- ## [\[Hilo\] How many sessions can I open at the same time?](https://forum.sierrawireless.com/t/hilo-how-many-sessions-can-i-open-at-the-same-time/6470)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:45am UTC](https://forum.sierrawireless.com/t/hilo-how-many-sessions-can-i-open-at-the-same-time/6470 "2013-07-18T06:45:13Z")
Answer: The Hilo supports up to 8 sockets at the same time. These 8 sockets are shared between FTP/SMTP/TCP/UDP/… That means you can open for example: 8 TCP sockets/sessions (as server or as client) or 4 TCP + 4 UDP (a… --- ## [\[Hilo\] How to know SIM card is removed?](https://forum.sierrawireless.com/t/hilo-how-to-know-sim-card-is-removed/6469)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:43am UTC](https://forum.sierrawireless.com/t/hilo-how-to-know-sim-card-is-removed/6469 "2013-07-18T06:43:09Z")
Answer: There are two ways to do that. 1/ SOFTWARE WAY If your SIM card is removed when module is in idle or sleep mode, it’ll take about 2 minutes to get "+CREG: 0”. If your SIM card is removed when module is ongoing… --- ## [\[Hilo\] How to know the distance to the current BTS?](https://forum.sierrawireless.com/t/hilo-how-to-know-the-distance-to-the-current-bts/6468)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:42am UTC](https://forum.sierrawireless.com/t/hilo-how-to-know-the-distance-to-the-current-bts/6468 "2013-07-18T06:42:09Z")
\[Hilo\] How to know the distance between my Hilo and current BTS? Answer: You can use the \ command. Since the 6.00 software release, the Timing Advance (TA) is added to the notification of KCELL. The BTS se… --- ## [\[Hilo\] How to get SMS Delivery report?](https://forum.sierrawireless.com/t/hilo-how-to-get-sms-delivery-report/6467)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:40am UTC](https://forum.sierrawireless.com/t/hilo-how-to-get-sms-delivery-report/6467 "2013-07-18T06:40:28Z")
\[Hilo\] How to get SMS Delivery report? How to receive an acknowledgment after sending a SMS? Answer: To enable the SMS Delivery report URC, you need to set \ whatever SMS is PDU or TEXT mode. Also, if… --- ## [\[Hilo\] How to read Service Provider Name from SIM card?](https://forum.sierrawireless.com/t/hilo-how-to-read-service-provider-name-from-sim-card/6465)
**Author:** [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\ **Replies:** 0\ **Last updated:** [July 18, 2013, 6:38am UTC](https://forum.sierrawireless.com/t/hilo-how-to-read-service-provider-name-from-sim-card/6465 "2013-07-18T06:38:09Z")
\[Hilo\] How to read Service Provider Name from SIM card by +CRSM? Answer: This name is contained in a file in the SIM card. The file is called EF SPN (Service Provider Name), you can access to it with \