ICS-1000 Ion Chromatography System Operator's Manual

ICS-1000 Ion Chromatography SystemTTL Input Control TypesThe ICS-1000 TTL inputs respond to four types ofsignals to accommodate different controlling devices.The default control type, Normal Edge, is compatible withthe output signals provided by Dionex modules.If the device connected to the ICS-1000 does not send a normal edgesignal, select the appropriate control type. Refer to the documentationprovided with the controlling device and the information below to selectthe correct type.• Normal Edge: In normal edgeoperation, the negative (falling)edge of a signal turns on thefunction. For example, for theLoad/Inject function, thenegative edge switches theinjection valve position to Load.The action of the positive (rising) edge depends on the function: Forthe Load/Inject function, the rising edge switches the injection valveto the Inject position. For the Pump On function, the rising edge turnsoff the pump (and suppressor). For Autozero and Mark, the rising edgehas no effect.• Inverted Edge: The invertededge mode works identically tothe normal edge mode exceptthat the positive and negativeedges are reversed in function.• Normal Pulse: In normal pulseoperation, the negative (falling)edge of the TTL signal is theactive edge and the positive(rising) edge is ignored.A pulse width of 50 ms or moreis guaranteed to be detected. A pulse width of 4 ms or less isguaranteed to be ignored. The action for pulse widths that are greaterthan 4 ms and less than 50 ms is undefined.C-4 Doc. 031879-01 3/03