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232-STA Stereo TV Tuner |
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Quick Cloning/Setup
There's a quick and easy way to set up or "clone" tuners for applications using Notepad and HyperTerminal. Download the Quick Clone ZIP file at the right for a sample file and tips.
- Create a text file with Notepad as shown in the sample file
Add an Enter at the last line - Terminal uses the Enter to send each line.
- Save by job name.
- Open Windows Terminal set up for RS-232 control (COM port, 9600, 8 data bits, 1 stop, no handshake) and connect.
- Select the Transfer menu, select Send Text File, and choose the file you've just saved.
- HyperTerminal will execute all the commands in the file.
Troubleshooting
Symptom:
Front-Panel Channel Up does not operate, advances one channel when powered up
The RS-232 port has contact closures for Channel Up and Down on pins 4 and 9. Off-the shelf RS-232 control cables (such as consumer null modem cables) that include those wires can lock up channel operation. If the problem clears up when you unplug the RS-232 cable, use a cable with only 3 wires for GND, Transmit, and Receive.
Symptom: Problems with Cable channel tuning
There are three types cable channel systems, Cable, IRC, and HRC. While the Cable setting works for over 90% of installations, there are a few cable systems set for IRC and HRC channel frequencies. Here’s how to tell which is which:
- IRC– Channels 5 and 6 are missing. Change to IRC and they will appear.
- HRC – None of the channels work. Change to HRC.
RS-232/Closure Wiring
All drawings show pin numbers relative to a PC COM port or typical control system DB-9 RS-232 control port. Pin-outs to other types of control ports may vary. Pins 4 and 9 are momentary closures to GND (5).
RS-232 wiring for control or programming should only use pins 2, 3, 5. Cables with all pins wired can lock out front-panel programming and data communication (Pins 4 and 9 are inputs, not CTS/RTS).
Up to nine tuners can be daisy-chained from one RS-232 control port. Remember that you will need to use the Unit# address in your programming when you control more than one tuner from the same control port.
Set the first unit in the RS-232 chain to the highest Unit#, then wire in sequence to the last tuner in the chain. The reason for this is that CR tuners use an intelligent data bus - the highest number tuner receives all commands, and then passes on commands addressed to tuners with lower unit numbers. The next tuner in the chain does the same, and so on until the last unit.
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