Radyne DMD15 Installation And Operation Manual page 98

DMD15/DMD15L IBS/IDR Satellite Modem
The full handshake/acknowledgment involves a reversal of source and destination ID codes in the
next message frame, followed by a response code in the <OPCODE> field of the message packet
from the equipment under control.
If a command packet is sent and not received at its intended destination, a timeout condition can
occur because a response message is not received by the packet originator. On receiving devices
slaved to an M & C computer, the timeout delay parameters may be programmed into the
equipment in accordance with site requirements by Radyne Corp. prior to shipment, or altered by
qualified personnel. The FSN handshake routines must account for timeout delays and be able to
introduce them as well.
4.9.1.4 Global Response Operational Codes
In acknowledgment (response) packets, the operational code <OPCODE> field of the message
packet is set to 0 by the receiving devices when the message intended for the device is evaluated
as valid. The device that receives the valid message then exchanges the <SOURCE ID> with the
<DESTINATION ID>, sets the <OPCODE> to zero in order to indicate that a good message was
received, and returns the packet to the originator. This "GOOD MESSAGE" Opcode is one of nine
global responses. Global response opcodes are common responses, issued to the M&C
computer or to another device, that can originate from and are interpreted by all Radyne
equipment in the same manner. These are summarized as follows (all opcode values are
expressed in decimal form):
Response OPCODE Description
Command Not Allowed in LOCAL Mode
Command Not Allowed in AUTO Mode
The following response error codes are specific to the DMD15:
DMD15 Response Error Code Descriptions
MPARM_MODEMNUMBER_ERROR
MPARM_EXTREFERENCE_ERROR
TM051 - Rev. 5.8
Table 4-8. Response OPCODES
Good Message
Bad Parameter
Bad Opcode
Bad Checksum
Bad Destination
Unable to Process Command
Packet Too Long
MPARM_FREQUENCY_ERROR
MPARM_STRAP_ERROR
MPARM_FILTERMASK_ERROR
MPARM_DATARATE_ERROR
MPARM_EXTEXCCLOCK_ERROR
User Interfaces
OPCODE
000d = 0000h
255d = 00FFh
254d = 00FEh
253d = 00FDh
252d = 00FCh
251d = 00FBh
250d = 00FAh
249d = 00F9h
248d = 00F8h
OPCODE
0x0400
0x0401
0x0402
0x0403
0x0404
0x0405
0x0406
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