Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
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B800-00-880 Issue B<br />
*<br />
RS485/RS232 Switch<br />
RS232<br />
RS485<br />
Table 23 - Serial Enable Matrix<br />
Active<br />
St<strong>and</strong>by <strong>and</strong> Fail lines are used for RS232<br />
data.<br />
Parallel St<strong>and</strong>by control <strong>and</strong> Fail indication<br />
are disabled.<br />
St<strong>and</strong>by <strong>and</strong> Fail lines are used for RS485<br />
data.<br />
Parallel St<strong>and</strong>by control <strong>and</strong> Fail indication<br />
are disabled.<br />
Serial Enable<br />
Inactive<br />
St<strong>and</strong>by <strong>and</strong> Fail lines are used for parallel<br />
St<strong>and</strong>by control <strong>and</strong> Fail indication.<br />
Serial communications are disabled.<br />
St<strong>and</strong>by <strong>and</strong> Fail lines are in (RS485) high<br />
impedance state. *<br />
Serial communications are disabled.<br />
Pump target speed will switch between Run Speed <strong>and</strong> St<strong>and</strong>by Speed in response to any data driven onto<br />
the RS485 bus by other devices connected to the bus. Activation of the parallel Start line not recommended<br />
with the RS485/232 switch in RS485 position <strong>and</strong> Serial Enable Inactive. Deactivation of the Serial Enable<br />
line is not recommended with the pump running following a start from the parallel Start line when the<br />
RS485/232 switch is in the RS485 position.<br />
Operation<br />
In Parallel Control Mode, the pump will not accept serial stop comm<strong>and</strong>s but will accept all other serial comm<strong>and</strong>s.<br />
When Serial Enable is active the pump will run at st<strong>and</strong>by speed if it has been comm<strong>and</strong>ed to do so by a serial St<strong>and</strong>by<br />
comm<strong>and</strong>. When Serial Enable is inactive <strong>and</strong> the RS485/RS232 switch in RS232 position, the pump will run at st<strong>and</strong>by<br />
speed when the parallel St<strong>and</strong>by line is active.<br />
In Serial Control Mode, the state of the parallel Start line will be ignored but the Serial Enable line provides an<br />
interlock function as shown in Figure 19. This interlock function only operates with serial Start comm<strong>and</strong>s <strong>and</strong><br />
therefore only in Serial Control Mode. In Serial Control mode the pump cannot be comm<strong>and</strong>ed to st<strong>and</strong>by speed by<br />
the st<strong>and</strong>by line, instead a serial st<strong>and</strong>by comm<strong>and</strong> must be used.<br />
The parallel Normal <strong>and</strong> Analogue Output signals provide valid pump status information at all times under mixed<br />
parallel <strong>and</strong> serial operation. The Analogue Output voltages are described in Table 10.<br />
© <strong>Edwards</strong> Limited 2009. All rights reserved. Page 55<br />
<strong>Edwards</strong> <strong>and</strong> the <strong>Edwards</strong> logo are trademarks of <strong>Edwards</strong> Limited.
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