What Baud Rate And Port Settings Should I Use; I See "Buffer Overflow" Or "Parity Bad" Messages On The Front Panel; How Do I Check The Logic Levels And Pinouts Of The Serial Ports; Why Does My Port A Logic Level Appear As - evertz 8084 Instruction Manual

TROUBLESHOOTING
Models 8084/8084AD/8085 Closed Caption Encoder Manual
6.1.4

What baud rate and port settings should I use?

While the unit is capable of running at 38.4kbaud 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 and 50 characters per second per field
for PAL. 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; 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.
6.1.5 I see "BUFFER OVERFLOW" or "PARITY BAD" messages on
the front panel.
Please refer to the previous question, 6.1.4 "What baud rate and port
settings should I use?"
6.1.6

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. Instructions are
provided under 5.5.3 "Viewing Firmware and PLD Revision Levels". Since
ports B and C only have two possible pinouts (with 8058 submodule), the
logic level setting and pinout are generally synonymous. The only way to
verify the pinout of port A is to remove the top cover and examine the
locations of the jumpers in jumper block J9.
6.1.7

Why does my Port A logic level appear as "???"

Earlier revisions of the IO PLD did not have the ability to read-back this
data. Your caption encoder will need to be sent to the Evertz factory for a
PLD upgrade before this feature will function.
6.1.8

How do I check the status of my power supplies?

Power supply status can only be monitored on caption encoders with an
8058 submodule and dual power supplies. Refer to 5.5.3 "Viewing
Firmware and PLD Revision Levels"
Revision 1.6.6
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