Operations Manual: HPAC-100/125/150/200/250-RM SSPA
B-7
Appendix B
Communication Protocol
A user’s M&C system can only communicate with a redundant system via an
RS-485 interface.
Commands
The commands associated with a stand-alone unit are valid with the following addi-
tions. The response to each new command is ACK or NAK.
Set Switching Mode
Determines whether the RF switching occurs automatically or manually when a
summary fault is registered.
Type:
COMMAND
Pkt Length:
7
Destination:
SSPA System Address
Source:
M&C Address
Command:
0x30
Data:
Unit ID:
(1 byte, integer)
[ 0 ]
system controller
Switching Mode:
(1 byte, integer)
0 = Manual
No switching on summary fault.
1 = Auto
Switching occurs on summary fault.
Length:
9 bytes
Select Standby Amp
Selects which SSPA unit is designated as the standby amplifier. This command is
not acknowledged if the switching mode is set to Auto.
Type:
COMMAND
Pkt Length:
7
Destination:
SSPA System Address
Source:
M&C Address
Command:
0x31
Data:
Unit ID:
(1 byte, integer)
[ 0 ]
system controller
Standby Amp:
(1 byte, integer)
1 = Amp1
Set amp 1 as the standby amplifier.
2 = Amp2
Set amp 2 as the standby amplifier.
Length:
9 bytes
Queries
All queries associated with a stand-alone unit are valid, however, the queries
Report
Unit Faults and Report Unit Diagnostics contain additional information.
Report System Summary can be used as a system query or as a unit query. When
this response is coming from the system controller, Unit ID = 0, the “Go” status
indicates that at least one amplifier in the redundant configuration is operational.
The “No Go” status indicates that all amplifiers are faulted.
Summary of Contents for HPAC-100-RM
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