HD9084 HDTV Caption Encoder Manual
TROUBLESHOOTING
Page 6-7
6.3.7.
What Baud Rate and Port Settings Should I Use?
While the unit is capable of running at 57.6k baud on all internal serial ports, it is not necessary to run at
the fastest baud rate possible for most captioning operations. NTSC captions are encoded at a
maximum of 60 characters per second in each field. A serial port set to 1200 baud can transfer data at
up to 120 characters per second including 7-bits of data, start, stop and parity bits. This is adequate for
most captioning applications since the communications overhead is generally very low.
Some older PC’s do not function correctly at over 19.2k baud, especially when running under Windows.
Many PC’s also have difficulties at 19.2k baud and above when using only the software (XON/XOFF)
flow control method. Try turning on hardware (CTS/RTS) flow control on your computer if the captioning
software supports it, and/or reducing your communications baud rate. Make sure that you alter your
captioning computer’s serial port settings to match those of the caption encoder.
6.3.8.
How Do I Check the Logic Levels and Pinouts of the Serial Ports?
The logic levels (RS-232 or RS-422) can be checked from the front panel without removing the caption
encoder from service. Push PORTS to cycle through the ports display option. See section 3.2.3 Ports
Display.
6.3.9.
How Do I Check the Status of My Power Supplies?
Power supply status can be monitored from the front panel PSU STATUS 1 and 2 LED’s. If the LED is
on, the power supply is functional/present. If the LED is off, the power supply is non-functional/not
present. Note: The +2PS option (redundant power supply) must be ordered for both LED’s to be on.
6.3.10.
Captions are not Being Encoded at All
If there is no option in the captioning/teleprompter software for the Evertz encoder, configure your
software to communicate with an EEG 270, EEG 370 or EEG 470 model Smart Encoder. The Evertz
caption protocol is compatible with these units.
Make sure that the caption encoder unit is set to the correct video type, 525-60 for component NTSC.
Check that the caption keyer is turned on. There are green LED’s to the left of the HD/SD Keyer
ON/OFF pushbuttons that indicate HD-SDI and SD-SDI caption keyers are enabled. The encoder will
not encode new captions into the video if the keyers have been turned off.
Check your serial port communications settings. Make sure that these are identical between the caption
encoder and the attached captioning computer.
Check that the unit is receiving data from the serial port or modem.
Try enabling the built-in CEA-608 test message, as described in the manual section 3.4.2.6. If you still
cannot see captions, then it is likely that downstream equipment is corrupting the caption data, or your
caption decoder is not functioning correctly.
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