California Instruments 801RP Series User And Programming Manual
Also see for 801RP Series: Training manual
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Contents
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User and Programming Manual – Rev P California Instruments6. When the installation has completed, remove the CD ROM and store in a safe place.Reboot the PC to activate the new settings. You are now ready to start using the PGUI32software.9.4. Trouble Shooting - RS232CThis section provides guidelines for resolving communication problems that may occur whenusing the PGUI32 software under Windows 98/XP/2000/NT™.You may encounter problems when using the serial interface with the PGUI32 program thatis supplied with the interface option for this source.Symptoms:1. Unable to verify connection to the power source through RS232C interface. Timeoutoccurs and dialog box appears that asks if you want to switch to simulation mode. Anerror message (ERR -100) may appear on the front panel LED segment displays of thepower source.- Or -2. Verification is successful but slewing of voltage, frequency or current limit results in anERR -100.Things to check first:1. Is the PC com port you selected to use really available for this purpose? On older PC’scom port interrupts are often shared between com 1 and com3 as well as com2 and com4. If any of these other com ports is in use, it may prevent you from using the com portthat shares the same interrupt.2. Did you use the RS232C cable that was supplied with the P/RP AC source? This is nota null-modem cable and cannot easily be obtained at a computer store. If you do nothave the original cable, consult the PGUI32 on line help under Interface settings for awiring diagram.3. Did you connect the cable in the right direction? This cable is uni-directional and shouldbe marked with a SOURCE and a PC label. Make sure you connect the SOURCE sideof the cable to the back of the AC source and the PC side of the cable to the PC port.Resolution for Symptom 1The P and RP Series of AC sources require hardware handshaking to control data flow fromthe PC to the AC source. After receiving a command, the AC source asserts the DTR line tohold off further communication from the PC until the command just sent has beenprocessed. Under Windows 95, it is possible to use a 16 byte transmit buffer if a 16550UART is present. This FIFO exceeds the length of most AC source commands. Whenenabled, this mode may result in more than one command being placed in the UART outputbuffer. If this happens, the handshake from the AC source will not prevent the content of thisbuffer being sent to the AC source and thus will result in more than one command beingsent to the AC source.To resolve this problem, the UART FIFO length needs to be reduced or disabled altogether.The procedure to disabled the FIFO mode is outlined in the next paragraph.Note: If turning off the UART FIFO conflicts with other applications that need to run on thesame PC using the same COM port, this solution may not be acceptable. In this case, skipthis step and proceed to the second symptom resolution which relies on a softwareRP Series October 2005 37 |
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