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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 87
10.0 Serial Communication Protocol
This section describes the basic serial communication protocol between the Compact
Outdoor SSPA and a host computer. Serial port settings must be configured for 8 bit data at
no parity, with 1 stop bit.
The Amplifier will only respond to properly formatted protocol packets. The basic communica-
tion packet is shown in Figure 10-1. It consists of a Header, Data, and Trailer sub-packet.
10.1 Header Packet
The Header packet is divided into 3 sub-packets which are the Frame Sync, Destination
Address, and Source Address packets, as shown in Figure 10-2.
10.1.1 Frame Sync Word
The Frame Sync word is a two byte field that marks the beginning of a packet. This value is
always 0xAA55. This field provides a means of designating a specific amplifier packet from
others that may exist on the same network. It also provides a mechanism for a node to syn-
chronize to a known point of transmission.
10.1.2 Destination Address
The destination address field specifies the node for which the packet is intended. It may be
an individual or broadcast address. The broadcast address is 0xFF. This is used when a
packet of information is intended for several nodes on the network. The broadcast address
can be used in a single device connection when the host needs to determine the address of
the amplifier. The Compact Outdoor amplifier will reply with its unique address.
HEADER
(4 bytes)
DATA
(6-32 bytes)
Figure 10-1: Basic Communication Packet
TRAILER
(1 byte)
HEADER
(4 bytes)
DATA
(6-32 bytes)
TRAILER
(1 byte)
Frame Sync (2 bytes)
0xAA5
Destination Address
(1 byte)
Source Address
(1 byte)
Figure 10-2: Header Sub-Packet
Section 10: Remote Control Interface