8.1.1.3 Source Address

The source address specifies the address of the node that is sending the packet. All unique addresses, except the broadcast address, are equal and can be assigned to individual units. The host computer must also have a unique network address.

8.1.2 Data Packet

The data sub-packet is comprised of 6 to 32 bytes of information. It is further divided into seven fields as shown in Figure 8-4. The first six fields comprise the command preamble while the last field is the actual data.

HEADER (4 bytes)

DATA

(6-32 bytes)

TRAILER

(1 byte)

 

 

COMMAND PREAMBLE

 

 

DATA FIELD

 

 

 

 

 

 

 

Protocol ID

Request ID

Command

Data Tag

Error Status /

Data Length

Command Data

Data Address

Sub Structure

1 Byte

1 Byte

1 Byte

1 Byte

1 Byte

1 Byte

0 - 26 Bytes

 

 

 

 

 

 

 

 

 

 

 

 

Figure 8-4: Data Sub-Packet

8.1.2.1 Protocol ID

This field provides backward compatibility with older generation equipment protocol. It should normally be set to zero. This field allows the unit to auto-detect other protocol versions, which may exist in the future.

8.1.2.2 Request ID

This is an application specific field. The amplifier will echo this byte back in the response frame without change. This byte serves as a request tracking feature.

8.1.2.3 Command

The SSPA protocol is a table based protocol. It allows the user to view and modify data tables located on the controlled device. Throughout the remainder of this description, “sender” will refer to the host PC, and “receiver” will refer to the SSPA unit.

Sender and receiver are limited to two commands and two command responses. The Get Request command issued by a command sender allows monitoring of existing conditions and parameters on the receiver. The Get Request frame should not have any bytes in the Data Filed and be no longer than 11 bytes.

The Response frame from the receiver will contain a Get Response designator in the Command field. If the receiver does not detect any errors in the Get Request frame, the requested data will be attached to the response frame. The length of the Get Response frame

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Paradise RA 5785 manual Source Address, Data Packet, Protocol ID, Request ID, Command

RA 5785 specifications

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