[我试图找到正确的 AT 命令来与 17.04 上的 Trendnet TFM-561U 调制解调器通信，但一直没有成功。如果我采用默认值efax-gtk，那么这就是我在日志文件中得到的结果：
efax-0.9a: 14:54:09 opened /dev/ttyACM0
efax-0.9a: 14:54:09 Warning: unexpected response "CONNECT"
efax-0.9a: 14:54:15 sync: dropping DTR
efax-0.9a: 14:54:17 Error: modem command (Z&FE&D2S7=120&C0) failed
efax-0.9a: 14:54:17 failed page /home/john/temp/faxfile.pdf.001
efax-0.9a: 14:54:23 Error: modem command (ATZ) failed
efax-0.9a: 14:54:23 finished - invalid modem response
我很想知道这款调制解调器的正确 AT 命令，但我找不到。我正尝试使用 运行（即发送传真）efax-gtk。我将 USB Trendnet TFM-561U 调制解调器连接到我的 17.04 mate 系统上。这款调制解调器来自一个正常运行的 Windows 7 系统。我读到使用 Trendnet TFM-561U 调制解调器的 Efax-gtk。
$ sudo modprobe usbserial vendor=0x0572 product=0x1329
[ 332.455588] usb 1-2: new full-speed USB device number 5 using xhci_hcd
[ 335.025066] usb 1-2: New USB device found, idVendor=0572, idProduct=1329
[ 335.025070] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 335.025072] usb 1-2: Product: USB Modem
[ 335.025075] usb 1-2: Manufacturer: Conexant
[ 335.025076] usb 1-2: SerialNumber: 24680246
[ 335.572080] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[ 335.572244] usbcore: registered new interface driver cdc_acm
[ 335.572244] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 644.375732] usbcore: registered new interface driver usbserial
[ 644.375740] usbcore: registered new interface driver usbserial_generic
[ 644.375745] usbserial: USB Serial support registered for generic
$ ls -l /dev/ttyACM0
crw-rw---- 1 root dialout 166, 0 Sep 3 17:52 /dev/ttyACM0
我是该团体的一名成员dialout。