Comtech EF Data QAM256 - Manual (Page 64)

QAM256 Digital Video Modulator and Upconverter Remote Operations
TM077 – Rev. 4.0 C- 9
Example #4
Command Mod TX Enable. (On)
Example Parameters:
SYNC Byte = 16h (Always.)
Data Count = 00 01h
Source Address = FFh
Destination Address = 20h = 32 decimal
Frame Sequence Number = 7Fh
Opcode = 22 54h
Data = 01h (01h = On)
Checksum = 16h
Transmit Packet:
16 00 01 FF 20 7F 22 54 01 16
Response Packet:
16 00 00 20 FF 7F 00 00 9E
Error Response = 00 00 (Command OK)
C.2 Remote Port Modes of Operation:
The RLLP Remote Port Packet structure is as follows:
= Message format header character that defines the beginning of a
message. The character value is always 0x16, (1 byte).
= Number of bytes in the field, (2 bytes).
= Identifies the address of the equipment from where the message
= Identifies the address of the equipment where the message is to be
sent, (1 byte).
= Frame sequence number ensures correct packet acknowledgment and
data transfers, (1 byte).
= This byte identifies the message type associated with the information
data. The equipment processes the data according to the value in this
field. Return error codes and acknowledgment are also included in this
field, (2 bytes).
<…DATA…> = Information data. The number of data bytes in this field is indicated by
the value.
= The modulo 256 sum of all preceding message bytes excluding the
character, (1 byte).
QAM256 Common Query Set:
Query Opcode
Query Common ID
<2000h>
Query Common Control Mode <2001h>
Query Common Version <2002h>
Query Common Firmware <2003h>
Query Common Time <2004h>
Query Common Date <2005h>
Query Common Time & Date <2006h>
Query Common Alarms <2007h>
Query Common Alarm Mask <2008h>