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A second, more satisfying exercise (ctd) On the form, click on 'Command' followed by 'CommandSelection'. Then click on the plus sign beside 'Categories', then the plus sign beside 'Commands', then 'Zoom'. Click on 'Cam Zoom' and at the bottom of the list of commands, observe the command labeled "Direct 'pqrs'". The "'pqrs'" is an indication that you are going to modify the structure of the command. Click on that command. A Zoom Entry Box appears. This is your means of entering a value to inform the camera how far to zoom in or out. Place the cursor on the slider arm, depress the mouse button and drag the slider arm along the scale. When it reaches the point you're satisfied with, release the mouse button and a numeric value appears in the box immediately below the slider arm. This is the value that will be embedded in the command, in hex format. Note the number. Click on the base indicator to switch the box between decimal and hexadecimal notation. Now click the "O K !" button to process your input. The command has been sent to the camera, and the zoom entry box disappears. Now dismiss the command selection box.
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You should now have only the main form and Internet Explorer on the screen. View the image displayed on IE to verify that the camera's image has changed, indicating that the camera accepted your command (you may need to 'refresh' IE - our cable provider can be difficult to work with at times.). View the incoming entries (upper) log box to see that the camera responded with an ACK message and a completion message. The camera acknowledges receiving and processing the zoom command. Now view the lower command and verify that the number you entered into the zoom entry box appears in the hex command that was transmitted (it appears in the least significant nybble of the last four bytes preceding the "FF"). It will be in hex, so if you entered the number in decimal notation, convert that to hex to verify that the proper command went out. |
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