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Product Description

The Model 905 PC Notebook Comscope is the latest addition to Telebyte’s line of powerful and flexible PC based protocol analyzers. The Model 905 is a high performance data line monitor, bit error rate tester and emulator in a small configuration that supports all PC’s. The combination of the 905 and PC produces a powerful protocol analyzer.

The Model 905 PC Comscope is an external device and does not require the user to open up his PC. The 905 installs easily - just connect the cable to the parallel port on any PC and you’re ready to go. The Model 905 is equipped with a complete range of hardware interfaces which include RS-232, RS-422, RS-485 and V.35. Selection of the desired interface is under program menu selection.

The versatility of the Model 905 is unlimited with the included Protocol Emulator Program Interface (PEPI). With PEPI you can select either our off-the-shelf test analysis programs or write your own.

Operation of the 905 is under control of a program running on the PC. The Model 905 supports most WAN protocols including Asynchronous and Synchronous. The synchronous capability includes Bisync and IPARS, and Bit Oriented protocols such as SDLC, SNA, and X.25. The Model 905 captures the whole picture: Data, control leads, timed stamps and error conditions. This enables you to do extensive post-capture analysis of data, even at a different location. You can trap or search for any combination of these events, and not just data strings.

While small in size the 905 is high in performance. A co-processor enables it to monitor data lines on a full duplex basis to 64 KBPS and emulate up to 64 KBPS.

The Model 905 uses the PC’s com port as the communications link between the resources of the PC and the microprocessor inside of the Model 905.

User access to the Model 905 is via a DB25 male connector on the rear panel. A DB9 female connector is provided to access the PC.

Front panel switches allow selection of monitoring or emulation of either DTE or DCE. Eight status LED’s display TD, RD, RTS, CTS, DSR, DCD, DTR and RI.

Emulate Mode

A "State Programming" technique is used for emulation Four entries, or fields, are required for each instruction. The first is the instruction number called State; more than one instruction can have the same state number. The second field is called Wait For, which allows a specific condition to be set as a trigger. The Action field specifies the action to be taken when the wait-for condition occurs. The last field called Next State is used much like the "GO TO" statement in a BASIC computer program by moving the test to a new state.

Pull Down Menus

Pull down menus make the PC Comscope the ultimate in simplicity for the operator. Built-in HELP screens also assist the inexperienced user. The PC Comscope operates in ASYNC, SYNC, HDLC or in a mode called UNKNOWN whereby any serial data can be accepted and deciphered.

The Power Trap Menu

Your host is mysteriously disconnecting a certain terminal sometime during the night. Every few hours your PAD gets a CMDR citing invalid packet numbering. The PC Comscope trap facility is designed to diagnose problems like these. You specify certain conditions (not just data strings) and when they appear the PC Comscope will freeze the data. You can examine activity before and after, then use the trap menu to search for various possibilities.

PC Resources

The Model 905 has access to all of the resources of the PC such as disk drives, displays and printers. In the Data Journal mode, data is saved to DOS files for later viewing, analysis and printing.

Portability Package

The Model 905 PC Notebook Comscope is supplied with a convenient padded case to simplify carrying the unit and its accessories. This feature really makes the Comscope portable.

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