Specifications

Operations Manual, Redundant System Controllers 209351 REV B 89
7.4.3 Example 3
The host computer requests the RCP2-1200 network address. The PC request string
is listed below.
The RCP2-1200 replies with the following response string.
Byte
Position
Byte Value
(Hex)
Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 FF Destination Address is broadcast network address
4 10 Source address of Request originating PC Host
5 0 Protocol Version Compatibility Field must always be 0
6 6F Request ID byte is set by originator, will be echoed back by respondent
7 1 Command field for “Get” type request
8 0 “System Settings” tag indicates which data from respondent required in
response frame
9 8 Data Address field indicates the address of the RCP2’s network address
inside “System Settings” data set to 8
10 1 Data Length field indicates how many data bytes “System Settings” re-
quested from RCP (1 byte requested)
11 82 Arithmetic checksum of bytes number 3 through 10
Byte
Position
Byte Value
(Hex)
Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 A Destination Address of PC request originator
4 0 Source address of RCP respondent
5 0 Protocol Version Compatibility Field must be always 0
6 6F Echo of the Originator’s Request ID byte
7 3 Command field for “Get” type of the response
8 0 “System Settings” indicates which data from respondent is included in
response frame
9 0 Data Address field omitted and replaced with Error status code. 0 in this field
indicates absence of errors
10 1 Data Length field indicates how many data bytes “System Settings”
requested from RCP
11 0 Data field 1 contains data element 8 of “System Settings” data type.
“Unique Network Address”=0
12 7D Arithmetic checksum of bytes number 3 through 11