Comtech EF Data QAM256 - Manual (Page 72)

QAM256 Digital Video Modulator and Upconverter Remote Operations
TM077 – Rev. 4.0 C- 17
(0 = mask, 1 = allow)
Opcode: <204Fh>
Query a modulator's PRBS (test pattern)
Query response:
<1>
PRBS (0 = Normal, 1 = PRBS23, 2 = PRBS23M, 3 = PRBS15, 4 =
PRBS15M)
Opcode: <2051h>
Query a modulator's Base Band Loopback
Query response:
<1>
BB Loopback (0 = Normal, 1 = Loopback)
Opcode: <2053h>
Query a modulator's output power level
Query response:
<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: +0.0dbm, data returned = 00 00 00 00 = 00 decimal =
+0.0dbm
Ex: -25.0dbm, 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: <2054h>
Query a modulator's carrier control
Query response:
<1>
TX Enable (0=Off, 1=On)
Opcode: <2055h>
Query a modulator's carrier test
Query response:
<1>
TX Carrier (0=Normal, 1=CW)
Opcode: <2060h>
Query a modulator's channel table
Query response:
<1>
Channel Table (0 = EIA STD, 1 = EIA HRC, 2 =EIA IRC, 3 = Trad STD, 4 = Trad
HRC, 5 = Trad IRC)
Opcode: <2061h>
Query a modulator's channel
Query response:
<1>
Channel (See channel entry tables at end of protocol)
Modulator Command Opcodes
Opcode: <2240h>
Command a modulator's frequency
<4> Frequency (Binary value, 1 Hz steps)
(Without cable Upconverter the range = 43 MHz to 44 MHz, or
Optional 35 MHz to 37 MHz)
(With cable Upconverter the range = 50 MHz to 862 MHz)
(This command will cause the carrier to turn off)
Opcode: <2241h>
Command a modulator's data rate
<4> Data rate (Binary value, 1bps steps)
(This command will cause the carrier to turn off)
Opcode: <2242h>
Command a modulator's symbol rate