ComStream CM601, Installation And Operation Manual

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Command Descriptions 01-0799-401D 08/02 23
CD Data Control Mode (Config) (NV)
Use this command set the CM701 to monitor and respond to, or ignore, DCE-DTE
data control signals.
CD <response>
<response> parameter values are:
■
1 (default) ignore additional data control signals
■
2 respond to data control signals and cause receive data (RD) to be clamped
high when the demodulator is not in sync
Some data interface specifications include provisions for DTE-to-DCE handshake
signals in addition to normal data and clock signals. For example, the RS-449
specification includes the signals terminal ready (TR) and request to send (RS).
CE Channel Error Rate (Monitor)
Use this command to monitor the channel error rate only if the demodulator is
operating with decoding enabled. If CE is issued when the CM701 is not locked to
a receive carrier, or if the CM701 is operating uncoded, a remote ER 4 error
response or N/A front panel message will appear.
CE ?
The returned, two-digit value represents an exponential number. The first digit is
the mantissa, and the second is the exponent (for example, 26 represents 2x10
-6
, or
.000002).
From the front panel select:
Config > Monitor > Chan Err Rate
DB Doppler Buffer Fill Level (Monitor)
Use this query command to display the number of data bits currently in the data
buffer.
DB ?
The returned value is in bits, from 0 to the size of the doppler buffer.
DBB Doppler Buffer Size (Config) (NV)
Use this command to set the size of the data buffer in bits.
DBB <bits>
<bits> parameter value range is from 64 bits to 262144 bits. Buffer sizes are 2
6
,
2
7
, and so on, to 2
18
bits. The default size is 262144 bits.
To set the data buffer by entering the buffer length in milliseconds instead of bits,
use the DBD command.