Comtech EF Data QAM256 User Manual
Page 74
QAM256 Digital Video Modulator and Upconverter
Remote Operations
TM077 – Rev. 4.0
C-
19
(Bit
6
=
Spare)
(Bit
7
=
Spare)
(0 = mask, 1 = allow)
<1>
Minor Alarm1
(Bit 0 = Clock Activity Fault)
(Bit
1
=
Data
Activity
Fault)
(Bit
2
=
FIFO
Fault)
(Bit 3 = Mod Clock Activity Fault)
(Bit
4
=
Spare)
(Bit
5
=
Spare)
(Bit
6
=
Spare)
(Bit
7
=
Spare)
(0 = mask, 1 = allow)
<1>
Minor Alarm2
(Bit 0 = Spare)
(Bit
1
=
Spare)
(Bit
2
=
Spare)
(Bit
3
=
Spare)
(Bit
4
=
Spare)
(Bit
5
=
Spare)
(Bit
6
=
Spare)
(0 = mask, 1 = allow)
Opcode: <224Fh>
Command a modulator's PRBS (test pattern)
<1>
PRBS
(0 = Normal, 1 = PRBS23, 2 = PRBS23M, 3 = PRBS15, 4 =
PRBS15M)
Opcode: <2251h>
Command a modulator's Base Band Loopback
<1>
BB Loopback
(0 = Normal, 1 = Loopback)
Opcode: <2253h>
Command a modulators output power level
<4>
Tx Power
Without cable Upconverter, value is in dBm.
(Signed value. +00 to -250 (+0.0 to -25.0 dBm)
(Implied decimal point)
Ex: +0.0 dBm, data returned = 00 00 00 00 = 00 decimal = +0.0
dBm
Ex: -25.0 dBm, data returned = FF FF FF 06 = 100000000 –
FFFFFF06 = FAh = 250 = -25.0 dBm
With cable Upconverter, value is in dBv.
(Signed value +450 to +600 (+45.0 to +60.0 dBv)
(Implied decimal point)
Opcode: <2254h>
Command a modulator's carrier control
<1>
TX Enable
(0=Off, 1=On)
Opcode: <2255h>
Command a modulator's carrier test
<1>
TX Carrier
(0=Normal, 1=CW)
Opcode: <2260h>
Command a modulator's channel table
<1>
Channel Table
(0 = EIA STD, 1 = EIA HRC, 2 =EIA IRC, 3 = Trad STD, 4 = Trad
HRC, 5 = Trad IRC)
Opcode: <2261h>
Command a modulator's channel
<1>
Channel
(See channel entry tables at end of protocol)
The following information is applicable to the QAM256 Cable Upconverter: