MOXA Data Scope utility, which uses two standard COM ports on the monitoring PC, behaves the same as a PC-based data scope, letting you set a trigger condition, capture comm. Data, and monitor signal status with time stamp on an RS-232 line. The line speed can be as high as 921.6 Kbps, depending on the COM port speed, even while using Data Scope to monitor your serial device connection. You can also save data and status to a hard disk for later analysis, and when used in conjunction with the proper debugging cable, comm. Activities can be monitored online without interfering with data transmission.

FEATURES
• Great for troubleshooting and debugging serial communication problems
• FREE and easy to use
• Supports transparent data monitoring, line status monitoring, and data logging
• With the right hardware tool, you can debug RS-232, RS-422, and RS-485 application

SYSTEM REQUIREMENTS
• Two PCs running Windows 95/98/NT/2000/XP (you may also use notebook computers by using a PCMCIA to serial adapter, or USB to serial adapter)
• One PC must have 2 free RS-232 or RS-422/485 ports
• One serial device
• One special debug cable-wiring and pinout diagrams are downloaded with the software

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>> How to make a Data Scope Cable (pdf, 150 K)