null modem serial cable

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What is the difference between a direct serial cable and a null modem serial cable?

three types of connections: Male to female, male to male. Mother to mother. Each of the three connectors has crossover lines and straight lines, so there is a total of 6 connections in the same way.Question 2: How to identify the cross-serial line and direct-connect serial line?Check it with a multimeter. Suppose 2 and 2 pass. The general 3 and 3 are straight serial

Java serial port programming (SMS Modem ).

Keywords: Java serial port programming, SMS Modem, AT command Ultimate Goal: provide a stable and reliable Java SMS sending server in Linux. Stage 1: Coding and testing on the Win32 platform; Stage 2: deploy and test on the Linux platform; Directory: Related Resources: (Java Communication package) Preparation for Win32 serial Programming Test procedure and

Java Serial Programming (SMS modem) __ algorithm

search order for Javax.comm.properties is as follows: Java code 1. Current directory.2. Each directory in ${java.classpath} (ie. $CLASSPATH Or-classpath setting). 3. 1. Current directory. 2. Each directory in ${java.classpath} (ie. $CLASSPATH or-classpath setting). 3. List all serial ports and ports of the system to find the serial name used in the SMS mod

Use minicom and USB serial cable under Fedora

First, minicomFedora is not like the previous redhat, can not directly input minicom Enter, because there is no modem in the directory/dev/sub-directory, and minicom run by default is the directory, so the direct knock is not. But you can enter Minicom-s carriage return, so you can set the path of Minicom,/dev./modem to/dev/ttys0, and then set a soft connection, ln-s/dev/ttys0//dev/

Use minicom and USB serial cable in ora

1. Unlike the previous RedHat statements, minicomFedora cannot directly enter minicom and press enter, because there is no modem subdirectory under the/dev/directory, and minicom runs in this directory by default, therefore, it is impossible to directly knock. However, you can enter minicom-s and press enter to set the path of minicom and set/dev. /modem can be changed to/dev/ttyS0, and then a soft connecti

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