Software Communication 3-7
Checksum
The checksum is the last byte of the message string. All bytes (excluding line
synchronization and checksums) are XORed to form an 8-bit checksum. This is
appended as the last character of the block. The receiver compares the transmitted
value to the computed value. If the two values match, an error free transmission is
assumed; otherwise, a transmission error is assumed.
OEM PROTOCOL ANSWER BLOCK CHARACTERS
The answer block characters in the OEM communication protocol are described below.
Only the unique answer block entries are listed in this section. For common commands
and answer block commands (characters), see the previous section, “OEM Protocol
Command Block Characters.”
Master Address
The master address is the address of the host system. This should always be 30h
(ASCII value “0”).
Status and Error Codes
The status and error codes define pump status and signal error conditions. For a
description of status and error codes, see “Error Codes and Query Status” in this
chapter.
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