Comtech EF Data TRP500 - Manual (Page 71)

TRP500-4450 C-Band Outdoor Amplifier Revision 1
Appendix B MN-TRP500
B–5
B.2.4.1 Start of Packet
¾ Controller-to-Target: This is the character '<' (ASCII code 60).
¾ Target-to-Controller: This is the character '>' (ASCII code 62).
Because this is used to provide a reliable indication of the start of packet, these two characters
may not appear anywhere else within the body of the message.
B.2.4.2 Target Address
Up to 9,999 devices can be uniquely addressed. In RS-232 applications this value is set to 0. In
RS-485 applications, the permissible range of values is 1 to 9999.
IMPORTANT
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.
B.2.4.3 Address Delimiter
This is the “forward slash” character ' / ' (ASCII code 47).
B.2.4.4 Instruction Code
This is a three-character alphabetic sequence that identifies the subject of the message. Wherever
possible, the instruction codes have been chosen to have some significance. For example: GAC
for Global Amplifier Configuration; IPA for IP Address, etc. This aids in the readability of the
message, should it be displayed in its raw ASCII form. Both upper case and lower case alphabetic
characters may be used (A-Z and a-z, ASCII codes 65-90 and 97-122).