MODULAR SMART SWITCH
10. Troubleshooting
The Modular Smart Switch is designed to a high standard and all units are fully tested before leaving the factory. There are no
10.1 Self-Test at Power-On
The Modular Smart Switch automatically tests its basic operation when it powers on. The buffer indicators flash for a few seconds while the test is being conducted and go out when the test has passed. If the buffer indicators do not flash or do not go out, then there may be a
10.2 Parallel Interfaces—No Data Transmitted through the Switch
If you have problems transmitting data through the switch using parallel interfaces, make sure that the direction (input or output) has been set
The channel indicators show whether data is being routed correctly from one port to another.
10.3 Parallel Interfaces—Corrupted, Extra, or Lost Data
Problems with corrupted data when using parallel communication are rare. When problems do arise, they are mostly cabling problems. Avoid using ribbon cables. Use shielded cables and keep the length to 22.9 ft. (7 m)
or less where possible. Problem cables can cause occasional data corruption and spurious page feeds on laser printers.
MODULAR SMART SWITCH
10.4 Problems Interfacing Serial Devices
Most problems experienced with connecting serial devices are caused by incorrect cabling or incorrect handshake/protocol settings. Do not assume that, because a cable has the correct connectors and works between two other devices, it will work when connected to the Modular Smart Switch. Always use the cabling specified in this manual (see Appendixes A and B). Incorrect cabling may cause many different problems, such as:
•No data transmission
•Loss of data, corrupted prints and plots
•Unreliable file transfer
10.5 Serial Interfaces—No Data Transmitted through the Switch
Check that you can send data between your devices using a direct connection. If you can’t, check your devices. If you can, connect the Modular Smart Switch and try sending a small amount of test data.
If the input channel indicator comes on, then no data is being sent into the
If the channel indicator flickers or comes on, then data is being transferred into the Modular Smart Switch.
If no data appears to be transmitted out from the Modular Smart Switch, then check the cable between the switch and your output device.
If the channel indicators go out after the timeout period (usually 16 seconds), then all the data has been sent out of the switch. If nothing appears to have been received on your output device, then check the protocol (a protocol problem often causes the data to be changed into a stream of null characters).
10.6 Serial Interfaces—Corrupted Data
The most common cause of corrupted data when using serial interfaces is a handshake problem. If you experience corrupted data when using serial ports, check that the protocols set on your equipment are the same as those set on the Modular Smart Switch. If you are using hardware handshake, check that the hardware
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