Technical FAQ

1. The loopback test is using 1 PC to test the USR Product.You can send the data with ethernet and receive with serial port. And you also can send data with serial port and receive with ethernet. 2. Please link your Ethernet cable, 5V adapter and serial wire to your TCP M4 series module
1. Open Telnet Timeout function and description. Modules program parameter in webpage as below: Telnet timeout figure mean the time for no data timeout, 0 is not open, Max figure is 255, unit is seconds. If network side and serial port no data, the continuous time exceed Telnet Timeout set figure, after than module disconnect
As for RS232 pin ( draw forth IO port) to measure level GND reference TXD -4.92V RXD -10.21V RTS +5.36V CTS +10.65V RS232 is negative logic, TXD and RXD idle state logic is 1, voltage at 3~-15V, conform to definition. RTS: Request send, module output pin, valid mean can received CTS: Clear send, module received
1. Serial device server setup parameters 2. Router setup method Check whether the WAN port to Public IP address 3. Port Forwards port 23419 IP: PC address 4. Computer connected to a wireless router openwrt 5. Check computer’s IP address ( 6. Check computer’s IP address 7. Ethernet Module serial port to connect PC, using
Many user doubt: Why GPRS / GSM modems only can go into a public IP computer? Can it work at a campus network/corporate network? Answer: Yes, it can. But it need cooperate with campus network/corporate network. Detail explanation as below: GPRS / GSM modems connect to network is send a TCP/UDP connection, during connection and communication
SMS DTU transparent transmission mode setting method Set SMS transparent transmission mode two major commands AT+CIMOD=”MOD” Configuration module operating modes: MOD said operating mode, 0 means transparent transmission mode, 1 serial command mode, two said AT command mode, 3 HTTPD Client mode, four said messaging transparent transmission mode. Configuration command: AT + CIMOD = “4”
GPRS modules are connected server setting method 1. Module settings: server address and port 2. Setting method to connect to the server: 3. Server open TCP232-Test software, set up the network protocol for the TCP server.Listen to the local port 25568. GPRS modules to initiate the link to the server,you can see the module launched
1. Router setup method Check whether the WAN port to Public IP address, (WAN IP Address must be a public IP). Port Forwards port: 23419 IP: PC address 2. Set the module parameters 3. Computer connected to a wireless router openwrt 4. Check computer’s IP address 5. Check computer’s IP address 6. GPRS modems
GPRS / GSM modems using the AT commands query version number 1. AT command 2. Use software to set the module Returns the version number: V3.19
1. GPRS Modules Settings check whether the serial parameters of working parameters and the GPRS modules of GPRS modems agreement serial line, check whether it is normal check the line connection is normal check using the serial line sequence, TXD to RXD, RXD to TXD, GND to GND check whether electricity module, check module power