When triggering on options 0 or 2, the measurement on the first specified channel (Parameter 3) is compared to the limit specified in Parameter 8. The user's multiplier and offset are not applied before the comparison: the limit must be entered in units of millivolts. If a digital trigger (low < 1.5V, 3.5 V < HIGH < 5 V) is used, it must be input to Digital Control Port #1. Option 2 is useful when 2 or more CR10's are required to start "Bursting" at the same time. For example, Digital Control Port #1 of all the CR10's involved are connected in parallel. The master CR10 sets its Digital Control Port #1 high when the trigger condition is met. The remaining dataloggers, programmed with option 1, trigger on the digital signal. The master CR10 sets Port #1 low when its measurements are completed.

Five trigger options are available for the second digit in Parameter 4: 0 trigger immediately, start saving or sending data with the first measurement made; 1 trigger if the measurement is greater than the limit entered or if the digital trigger is high; 2 trigger if the measurement is less than the limit or if the digital trigger is low; 3 trigger on rising edge; i.e., when the measurement goes from below to above the limit or when the digital trigger goes from low to high; 4 trigger on falling edge; i.e., trigger when measurement goes from above the limit to below it or when the digital trigger goes from high to low. When triggering on the rising or falling edge, the input must make the specified transition to trigger. For example, when triggering on the rising edge, if the input starts out high, it must go low and then high again to trigger.

DATA SENT TO INPUT STORAGE When the measurements are sent to Input Storage, Parameter 6 is used to specify the number of scans made on the channels being measured (the CR10 multiplies the number entered by 1000). The measurements from each channel are stored contiguously. For example: Parameter 1 specifies 4 channels are to be measured, Parameter 6 specifies 250 scans (0.250 entered), and Parameter 10 specifies 1 as the first input location to store data. The measurements from the first channel will be stored in input locations 1-250, those from the second channel in locations 251-500, etc. If insufficient locations are allocated to Input Storage (*A) to accommodate the number of locations called for by Parameter 6 multiplied

SECTION 9. INPUT/OUTPUT INSTRUCTIONS

by Parameter 1 (e.g., 250 x 4 = 1000), an error code, E 60, will be displayed when the program is compiled.

The number of scans determines how many samples will be saved, and hence, when Instruction 23 will be completed and execution will pass on to the next instruction. Measurements before and/or after the trigger can be saved. Parameter 7 determines how many scans that occurred prior to the trigger are saved. For example, if 250 scans are specified, and an offset of 20 is entered for Parameter 7, then the trigger measurement will be stored in location 21. Locations 1-20 will contain the measurements that preceded the trigger and 22-250 will contain the measurements following the trigger. If only 10 measurements are made before the trigger, then they will be stored in locations 11-20 while the value -99999. will be stored in locations 1- 10 for which no measurements were made.

DATA SENT TO SERIAL PORT

When the raw A/D data is sent out the serial port, the measurement data is not buffered and hence, only the trigger and subsequent measurements can be sent. The number of measurements is determined by Parameters 1 and 6. Because the total number of measurements are limited only by the storage of the receiving computer, this can be a very large number. Parameter 6 is the number of measurements per channel to send in units of 1000 (e.g., 0.001 represents 1 measurement). If 0 is entered for Parameter 6, the CR10 will continue to send data until the Instruction is aborted by pressing any key on the CR10KD Keyboard Display.

Raw A/D data may be sent to a maximum of 8 SM192 or SM716 Solid State Storage Modules (SM's) at 76.8K baud (Parameter 4, Destination Option C = 3). All SM's connected should be set to Fill and Stop and have consecutive addresses. The Burst data will be sent to the first available (lowest address) Storage Module, followed by the next lowest addressed, and so on. If the data is retrieved from the SM's using SMCOM.COM, a Storage Module communications program contained in the PC208 Datalogger Support Software, the data collection format must be "A as stored 8 bit". This will transfer the raw A/D data to a computer file. The raw A/D data can be converted to ASCII using SPLIT.COM, a

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