# 5.1.1.AT Command * 1.AT+CPIN? * Description: 確認是否已輸入密碼 * Success Response: ``` +CPIN:READY OK ``` * Error Response: ``` +CPIN: +CME ERROR: ``` * Example: * 2.AT+CSQ * Description: 取得模組的signal quality:+CSQ:\,\ * Mode: * 1.AT+CSQ? * returns the signal strength of the device ``` Value RSSI dBm Condition 2 -109 Marginal 3 -107 Marginal 4 -105 Marginal 5 -103 Marginal 6 -101 Marginal 7 -99 Marginal 8 -97 Marginal 9 -95 Marginal 10 -93 OK 11 -91 OK 12 -89 OK 13 -87 OK 14 -85 OK 15 -83 Good 16 -81 Good 17 -79 Good 18 -77 Good 19 -75 Good 20 -73 Excellent 21 -71 Excellent 22 -69 Excellent 23 -67 Excellent 24 -65 Excellent 25 -63 Excellent 26 -61 Excellent 27 -59 Excellent 28 -57 Excellent 29 -55 Excellent 30 -53 Excellent ``` * 2.AT+CSQ=? * list of supporteds * Example: ``` AT+CSQ? +CSQ:18,99 ``` * 3.AT+COPS? * Description: 指定或是取得模組的訊號種類(2G/3G/4G) * Mode: * 1.AT+COPS? * 取得目前模組的訊號種類 * 0 GSM (2G) * 1 GSM Compact (2G) * 2 UTRAN (3G) * 3 GSM w/EGPRS (2.75G) * 4 UTRAN w/HSDPA (3.5G) * 5 UTRAN w/HSUPA (4G) * 6 UTRAN w/HSDPA and HSUPA (3.5G and 4G) * 7 E-UTRAN (3G) ![](https://3840825399-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M4M0G8PXRnA3yHgZCAL%2F-M4M0Gn8DmjJ2aT88bjY%2F-M4M0IZ3dcABpSFZjEAx%2F%E8%9E%A2%E5%B9%95%E5%BF%AB%E7%85%A7%202017-06-13%20%E4%B8%8B%E5%8D%886.35.27.png?generation=1586302897340553\&alt=media) * 2.AT+COPS=? * list目前模組可用的訊號種類 * 3.AT+COPS=\[\[, \[,\[,]]]] * 指定模組的訊號種類 * 4.AT^SIND? * Description: * Mode: * 5.AT^SCFG? * Description: * Mode: * 6.AT+CGDCONT * 7.AT+CGCONTRDP