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allowing a read of up to 256 addresses from system memory. It commands the Tan Delta unit
addressed by <iaddr> to transmit <length> memory bytes starting at <address>. If the command
is correctly interpreted, the Tan Delta unit addressed will acknowledge the command with the
Ack code, echo the number of bytes it will transmit, and send a response containing all the data
requested, followed by a checksum. If the command is not correctly interpreted, or the starting
<address> is outside the range of system memory, the Tan Delta unit addressed will acknowledge
with the Error code and a checksum. If the unit addressed cannot be found, there will be no
reply.
The command string is 10 bytes long (no. of bytes in each field as subscript):
“!”,<09
1
>,<iaddr
1
>,“R”,“m”,<record no
2
>,<length
1
>,<cksm
2
>
The response string comprises the acknowledge character, the <count> of bytes to follow and
then <length> bytes, followed by a 16 bit checksum.
Thus the response string is (4 + <length>) bytes long (no. of bytes in each field as subscript):
“A”,<2
1
>,<byte 1>,<byte 2>,...,<byte n*>,<cksm
2
>
(*n = length)
or, in case of error: “E”,<02
1
>,< FFB8
2
>
11.1.5 Read Config Data Command “Rc”
This command has two items of data, a two byte <starting address> and a single byte <length>.
It commands the Tan Delta unit addressed by <iaddr> to transmit <length> bytes from <starting
address> relative to the start of the channel settings and alarm array for each of the three
channels within the unit, and the two relays and eight alarm definitions. Config settings are as
defined below and must be correctly interpreted by the receiving system. If the command is
correctly interpreted, the Tan Delta unit addressed will acknowledge the command with the Ack
code, echo the number of bytes it will transmit, and send a response containing the data
requested, followed by a checksum. If the command is not correctly interpreted, the Tan Delta
unit addressed will acknowledge with the Error code and a checksum. If the unit addressed
cannot be found, there will be no reply.
The command string is 10 bytes long (no. of bytes in each field as subscript):
“!”,<09
1
>,<iaddr
1
>,“R”,“c”,<start address
2
>,<length
1
>,<cksm
2
>
The response string comprises the acknowledge character, the <count> of bytes to follow and
then <length> bytes of data, followed by a 16 bit checksum. The data returned will be dependent
on the particular parameters specified by the start address.
Thus the response string is <length> + 4 bytes long (no. of bytes in each field as subscript):-
“A”,<2
1
>,<length bytes of data>,<cksm
2
>
or, in case of error:- “E”,<02
1
>,< FFB8
2
>
11.1.6 Read Version and Serial Number Command “Rv”
This command has two items of data, a two byte <starting address> and a single byte <length>.
It commands the Tan Delta unit addressed by <iaddr> to transmit <length> bytes from <starting