ROC364 Instruction Manual
4-19 Communications
Cards
Rev
Jun/05
The following signal lines (output only) are available at the COMM port for wiring to an analyzer or
monitor:
COMM Port
Signal Line
Description
1 SPK Speaker
2 RXD
Receive
data
3 TXD
Transmit
data
4
DTR
Data terminal ready
5 COM Common
6 RI
Ring
indicator
7 SHUTDOWN
Disable
signal
lines
8
+5V
5-volts dc power
9
DSR
Data set ready
4.5 Troubleshooting and Repair
There are no user-serviceable parts on the communications cards. If a card appears to be operating
improperly, verify that the card is set up according to the information contained in Section 4.3, Installing
Communications Cards, on page 4-8. If it still fails to operate properly, the recommended repair
procedure is to remove the faulty card and install a working communications card. The faulty card
should be returned to your local sales representative for repair or replacement.
4.5.1 Replacing a Communications Card
To remove and replace a communications card on an in-service ROC, perform the following procedure.
Be sure to observe the cautions to avoid losing data and damaging equipment.
Change components only in an area known to be non-hazardous.
There is a possibility of losing the ROC configuration and historical data held in RAM while
performing the following procedure. As a precaution, save the current configuration and historical
data to permanent memory as instructed in Section 2, RAM Backup Procedure.
Failure to exercise proper electrostatic discharge precautions (such as wearing a grounded wrist
strap) may reset the processor or damage electronic components, resulting in interrupted
operations.
During this procedure, all power will be removed from the ROC and devices powered by the ROC.
Ensure all connected input devices, output devices, and processes remain in a safe state when
power is removed from the ROC and when power is restored to the ROC.
1.
To avoid losing data, perform backups as explained in Section 2, RAM Backup Procedure.
2.
Disconnect power to the ROC by unplugging the power connector.
3.
Remove the FlashPAC module.
4.
Remove the screws that hold the cover in place, and lift off the cover.