Specifications

88 209351 REV B Operations Manual, Redundant System Controllers
7.4.2 Example 2
The host computer requests the RCP2-1200 system thresholds. 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 0 Destination Address of RCP unit
4 A 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 1 “System Thresholds” tag indicates which data from respondent is required in
response frame
9 1 Data Address field indicates the beginning data address inside of the “System
Thresholds” data set to 1 (first element)
10 6 Data Length field indicates how many data bytes of the “System Thresholds”
requested from RCP (6 is all available data of “System Thresholds” type)
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 always be 0
6 6F Echo of the Originator’s Request ID byte
7 3 Command field for “Get” type response
8 1 “System Thresholds” 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 6 Data Length field indicates how many data bytes “System Thresholds” requested from
RCP (6 is all available data of “System Thresholds” type)
11 D1 Data field 1 contains least significant byte of data element 1 of “System Thresholds”
data type, which is LNA 1 cal. point
12 0 Data field 2 contains most significant byte of data element 1 of “System Thresholds”
data type, which is LNA 1 cal. point. Data can be normalized to LNA current as follows:
Lna1calpoint * 0.57mA/point=209* 0.57= 119.13 mA
13 D8 Data field 3 contains least significant byte of data element 2 of “System Thresholds”
data type, which is LNA 2 cal. point
14 0 Data field 4 contains most significant byte of data element 2 of “System Thresholds”
data type, which is LNA 2 cal. point. Data can be normalized to LNA current as follows:
Lna1 cal point * 0.57mA/point =216* 0.57= 123.12 mA
15 DC Data field 5 contains least significant byte of data element 3 of “System Thresholds”
data type, which is LNA3 cal. Point.
16 0 Data field 6 contains most significant byte of data element 2 of “System Thresholds”
data type, which is LNA 3 cal. Point. Data can be normalized to LNA current as fol-
lows:
Lna1 calpoint * 0.57mA/point=220* 0.57= 125.4 mA
17 8 Arithmetic checksum of bytes number 3 through 16