TRICONEX 3002 Communication card

1. Make sure the system is plugged in. 2. Check that the board is securely installed in its backplane or chassis. 3. Check that all necessary cables are connected to the board, per this manual. 4. Check for compliance with System Considerations, in Chapter 3. 5. Review the Installation and Startup procedures, in Chapter 3. The step-by-step powerup routine for your board is on page 3-17. Try it.1. The CPU board should be in the first (leftmost) slot if it is to be the system controller. 2. The “system controller” function requires that header J2 be set properly. See Chapter 3Restart the system by “double-button reset”: press the RESET and ABORT switches at the same time; release RESET first, wait five seconds, then release ABORT.

The EIA-232-D standard is the most common 

terminal/computer and terminal/modem interface, and yet it is not fully understood This may be because not all the lines are clearly defined, and many users do not see the need to follow the standard in their applications. Often designers think only of their own equipment, but the state of the art is computer-to-computer or computer-tomodem operation. A system should easily connect to any other system. The EIA-232-D standard was originally developed by the Bell System to connect terminals via modems. Several handshaking lines were included for that purpose. Although handshaking is unnecessary in many applications, the lines themselves remain part of many designs because they facilitate troubleshooting.

To interpret this information correctly

 remember that EIA-232-D was intended to connect a terminal to a modem. When computers are connected to each other without modems, one of them must be configured as a terminal (data terminal equipment: DTE) and the other as a modem (data circuit-terminating equipment: DCE). Since computers are normally configured to work with terminals, they are said to be configured as a modem in most cases. Signal levels must lie between +3 and +15 volts for a high level, and between -3 and -15 volts for a low level. Connecting units in parallel may produce out-of-range voltages and is contrary to EIA-232-D specifications

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