D374-20-880 Issue E
Page 30 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
6.2.4 Serial Communications Problems
If the serial communications do not operate correctly, check the items shown in Table 17.
Table 17 - Serial communications fault finding
Check Action
Is the control equipment operating? Ensure that the electrical supply to the control equipment is switched
on and that the control equipment is switched on.
Are the communications cables
connected?
Ensure that the communications cables are correctly connected to the
dry pumping system and to the control equipment.
Are the cables wired correctly? Ensure that the wires of the communications cables are correctly
connected to the dry pumping system and the control equipment
connectors. Refer to Table 2 for the RS232 connection details.
Is the control equipment configured
correctly?
Ensure that the baud rate, parity and stop bits of the control equipment
are correctly configured.
Are the cables too long? Ensure that the communications cables are less than 10m long. If the
communications cables are longer than 10m, ensure that the line-
drivers are correctly incorporated into the communications cables.
To Next Page
Loading...
