Product specifications

CDD-880 Multi Receiver Router Revision 0
Appendix B MN-CDD880
B–3
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.4.2 Target Address
In EIA-232 applications this value is set to 0.
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.4.3 Address Delimiter
This is the “forward slash” character '/ ' (ASCII code 47).
B.4.4 Instruction Code
This is a three-character alphabetic sequence, which identifies the subject of the message. Wherever possible, the instruction codes have been
chosen to have some significance – e.g., MLC for Management Link Configuration, IPA for Management IP Address, etc. This aids in the
readability of the message, should it be displayed in its raw ASCII form. Only upper case alphabetic characters may be used (A-Z, ASCII
codes 65 - 90).
B.4.5 Instruction Code Qualifier
This is a single character, which further qualifies the preceding instruction code. Code Qualifiers obey the following rules:
1. From Controller-to-Target, the only permitted values are:
Symbol Definition
=
(ASCII code 61)
The ‘=’ code is used as the Assignment Operator (AO) and is used to indicate that the parameter defined by the
preceding byte should be set to the value of the argument (s) which follow it.
Example: In a message from Controller-to-Target, IG1= aaa.bbb.ccc.ddd/yy would mean “set the GE Port IP address to
aaa.bbb.ccc.ddd/yy”