Comtech EF Data HPOD - Start of Packet; Target Address; Address Delimiter; Instruction Code

HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier Revision 6
Serial-Based Remote Product Management MN/HPOD.IOM
5–6
5.3.4.1 Start of Packet
• Controller‐to‐Target–Thisisthecharacter‘<’(ASCIIcode60).
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• Target‐to‐Controller–Thisisthecharacter‘>’(ASCIIcode62). 
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The‘<’and‘>’charactersindicatethestartofpacket.Theymaynotappearanywhereelsewithinthebodyofthemessage.
5.3.4.2 Target Address
Upto9,999devicescanbeuniquelyaddressed;inbothEIA‐485andEIA‐232applications,thepermissiblerangeofvaluesis1to9999.
TheaddressisprogrammedintoaTargetunitusingtheremotecontrolport.
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The Controller sends a packet with the address of a Target – the destination of the packet. When the Target responds,
the address used is the same address, to indicate to the Controller the source of the packet. The Controller does not
have its own address.
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5.3.4.3 Address Delimiter
Thisisthe“forwardslash”character'/'(ASCIIcode47).
5.3.4.4 Instruction Code
This isa three‐character alphabeticsequence thatidentifiesthemessage subject. Whereverpossible,the instruction codes havebeen
chosentohavesomesignificancetoaidinthereadability ofthemessage,shoulditbedisplayedinitsrawASCIIform.Only uppercase
andlowercasealphabeticcharactersmaybeused(A‐Z,ASCIIcode
s65‐90).
5.3.4.5 Instruction Code Qualifier
Thisisasinglecharacterthatfurtherqualifiestheprecedinginstructioncode.CodeQualifiersobeythef ollowingrules:
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1. FromController‐to‐Target,theonlyper mittedcharactersare: