Intermec Transaction Manager 9560, Руководство пользователя

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9560 Transaction Manager User’s Manual
2-16
Direct Wiring
Direct wiring to a port concentrator requires a cable with the following:
• One connector that is compatible with the port concentrator
• 25-pin, D-subminiature plug connector
The modem connector is wired as a Data Terminal Equipment (DTE) device.
For more information, see “Null Modem Cable Diagram and Modem
Connector Pin Assignments” earlier in this section.
Multi-Drop Line Wiring
You can connect one or more 9560s to a concentrator using RS-485 multi-drop
line wiring. The multi-drop layout consists of a main line up to 2000 feet long,
as shown in in the following diagram.
Multi-Drop Wiring to a Port Concentrator
Device Device Device
30 Ft Max
2000 Ft Max
Port Concentrator
9560-08U
You can connect up to 32 readers, with each a maximum of 20 feet from the
main line. If you use Intermec cable Part No. 047653, you can space the readers
up to 30 feet. Intermec has tested and approved this layout. Any other multi-
drop system layout may not work properly.
For multi-drop wiring, you need a cable that meets these standards:
• 4-wire cable with two individually shielded wire pairs
• One connector that is compatible with the computer
• 25-pin, D-subminiature plug connector
• At least 24-gauge wire
• Nominal impedance
≤
150 ohms
• Nominal capacitance
≤
20 pF/ft
• Attenuation
≤
6 dbv in 2000 feet.