L-1 Identity Solutions 4G Lite Installation Manual
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Contents
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Part # 430-4G-050-005© 2011 - L-1 Identity Solutions Inc. All rights reservedSystem Start-Up Procedures5.1.1 DEVICE CONFIGURATION CHECKDevices must be configured correctly before they can communicate. Common problemsinclude incorrect Host Port Protocol settings, mismatched Baud rates, and incorrect deviceNet-work IDs. Each device sharing a communication line must have a unique device NetworkID.5.1.2 RS-232 TO RS-485 CONVERTER GROUND FAULT CHECKBefore a device can be connected to an RS-485 subsystem, it must be checked for groundfaults. An uncorrected ground fault can damage all devices connected to the RS-485communication line.To check for a ground fault on the RS-232 to RS-485 converter:1. Apply power to the RS-232 to RS-485 converter.2. Connect the signal ground of the RS-485 line through a 10k ohm current-limiting resistorto the signal ground of the RS-232 to RS-485 converter. There should be no more than 1volt across the resistor.5.1.3 DEVICE GROUND FAULT CHECKTo check for a ground fault on a new 4G Lite device:1. Apply power to all devices already successfully connected to the RS-485 line.2. Power up the new device but do not connect it to the RS-485 line.3. Connect the signal ground of the RS-485 line through a 10k ohm current-limiting resistorto the signal ground of the 4G Lite device.4. There should be no more than 1 volt across the resistor. If there is, find and clear the fault.5. Repeat Steps 1 through 3 with each of the RS-485 signal lines (+ and -).6. Connect the new device to the RS-485 line only if no ground fault is found.60 |
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