921 +ve going start, -ve going stop Measures +ve pulse width Note: -ve edge refers to a negative-going edge, a transition from high to low. +ve edge refers to a positive-going edge, a transition from low to high. Event Count This facility permits a number of events to be counted. The events (transitions) to be included in the count can be +ve, -ve or both. Two types of count are offered: increment or totalise. These operate as follows: Increment. On receipt of a measurement trigger, an event count is started. Then on receipt of another measurement trigger, the event count is stopped. The result is sent to the 3595 4C Interface card and another count begins. Totalise. On receipt of a measurement trigger, events are counted until an HA (halt) command is received or until the channel mode is set to Event Count Increment. In the latter case, the counter is cleared prior to starting the incremental count. If a CL (clear) command is received at any time, the event counter is reset to zero. A new count is started on receipt of the next measurement trigger. The event counter of a particular channel is also cleared when that channel is set again to the totalise mode. The maximum number of events that can be recorded per channel by the counting circuitry is 16,777,215, after which the rolls over to zero. No indication of this is given. Table 2.6: Mode Codes for IMP type 2A (Switch IMP) Code, m Mode Set Comments 000 Skip 700 Digital Status Event capture: 760 -ve going edge Enabled by EV command only. 761 +ve going edge 762 +ve or going edge –ve 800 Switch output off (high) For digital output, sets channel to or logic ‘1’ ‘0’ 801 Switch output on (low) Note: -ve edge refers to a negative-going edge, a transition from high to low. +ve edge refers to a positive-going edge, a transition from low to high. Channels 29 to 32 are digital input/output channels. Digital outputs are set when the IMP devices receive the relevant CH MO command. For more details on each individual mode, refer to the IMP Installation Guide. Table 2.7: Mode Codes for IMP type 1H and 1J
921 +ve going start, -ve going stop Measures +ve pulse width Note: -ve edge refers to a negative-going edge, a transition from high to low. +ve edge refers to a positive-going edge, a transition from low to high. Event Count This facility permits a number of events to be counted. The events (transitions) to be included in the count can be +ve, -ve or both. Two types of count are offered: increment or totalise. These operate as follows: Increment. On receipt of a measurement trigger, an event count is started. Then on receipt of another measurement trigger, the event count is stopped. The result is sent to the 3595 4C Interface card and another count begins. Totalise. On receipt of a measurement trigger, events are counted until an HA (halt) command is received or until the channel mode is set to Event Count Increment. In the latter case, the counter is cleared prior to starting the incremental count. If a CL (clear) command is received at any time, the event counter is reset to zero. A new count is started on receipt of the next measurement trigger. The event counter of a particular channel is also cleared when that channel is set again to the totalise mode. The maximum number of events that can be recorded per channel by the circuitry is 16,777,215, after which the rolls over to zero. No indication of this is given. Table 2.6: Mode Codes for IMP type 2A (Switch IMP) Code, m Mode Set Comments 000 Skip 700 Digital Status Event capture: Enabled by EV command only. 760 -ve going edge 761 +ve going edge 762 +ve or –ve going edge 800 Switch output off (high) For digital output, sets channel to logic ‘1’ or ‘0’ 801 Switch output on (low) Note: -ve edge refers to a negative-going edge, a transition from high to low. +ve edge refers to a positive-going edge, a transition from low to high. Channels 29 to 32 are digital input/output channels. Digital outputs are set when the IMP devices receive the relevant CH MO command. For more details on each individual mode, refer to the IMP Installation Guide. Table 2.7: Mode Codes for IMP type 1H and 1J counting
3595-4U%20User%20Manual.docx