Try doing what I did, connect both serial in the rear of the unit AND the USB in front (selecting serial) and that should do it. My USB has not disconnected since I did that. For some reason it needs both (According to info from the Butel site.Ok, so my original post had me asking the question about the rear 536hp 9 pin serial port. I have a startech usb 1 to 9pin serial null modem cable,that was recommended. I have plugged it into the 9 pin port at the rear of the scanner and plugged in the usb to my PC. The cable has been recognized by the PC as being there. Windows 7 claims it has installed a driver for it but the Startech cable did come with a driver CD as well. My question still remains,,,what else must I do to make this communicate with the scanner when using Butel 536HP pro software? Just plugging it into the Radio and PC doesn't get it recognized and the only way I know of selecting serial mode is by having the other radio supplied cable plugged into the front port but that doesn't make sense by having 2 cables in at the same time, at least to me it doesn't. How about someone setting me straight and helping me get this right already.
Did you go into the setting and set the baud rate for the rear port to 115200 ?No, I have Null Modem cable, shows up as port 4 in dev mgr. Usb port shows as port 7. Both are set to 115k, but software doesn't see port 4, only USB port 7. If I disconnect port 4, the rear serial, then I get the USB drop from the front port. I ran a serial analyzer on the port and data is coming out of the scanner, but program is not picking it up. The "ScannerScreeen" software works on just the rear serial port ok. Even my proscan V.7 sees data coming and will log.