MNC-0500-026 6 of 32 Revision G
Amplifier Communication and Protocol, Rabbit CPU
response can be checked to determine the presence or absence of
a message-rejected code.
Printable protocol drawbacks are remedied by the non-printable
protocol. Because start and stop bytes are non-printable, they
cannot be confused with message parameters, which are
always printable. Also, different start bytes are used to indicate
whether a message was accepted or rejected. For nearly all
implementations, the non-printable protocol should be used.
If you send a message using the printable protocol, devices will
respond using the printable protocol. If you send a message
using non-printable protocol, devices will respond using the non-
printable protocol. There are no DIP switches to set, and there is
no software to configure. Xicom devices always respond in kind:
• Printable and non-printable protocols differ only in the characters used for start,
stop, and check bytes. Refer to, Start Byte, End Byte, & Check Byte.
• The “printable” protocol uses printable start and stop characters; check bytes are
generated using a method that produces printable ASCII characters.
• The “non-printable” protocol uses non-printable start and stop bytes; its check
byte algorithm can yield non-printable characters. Refer to Check Byte
Calculation and examples on Example of “Base 95”..
Communication Parameters
Communications can be configured as follows:
Baud rates: 1200, 2400, 4800, 9600, 19200, and 38400
Parity: None, Even, or Odd (Parity only available with 7 data bits)
Data bits: 7 or 8
Stop bits: 1
Flow control options should be set to “none”.
• The default communication parameters are 9600 baud, N/8/1, unless otherwise
requested.
• Parameters are selected on rack HPAs using the front panel interface.
• Parameters are selected on digital outdoor HPAs using a remote interface.
Table 1-1 Packet Format
Start
Byte
Address
Byte
Command
Byte(s)
Parameters
as Required
End
Byte
Check
Byte
CRLF
(Ethernet
Only)
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