Date Code 20010521
Unsolicited SER Protocol
F-5
SEL-387E Instruction Manual
00000000
Element status (unused)
cccc
Two-byte CRC-16 checkcode for message
Acknowledge Message
The acknowledge message is constructed and transmitted for every received message which
contains a status byte with the LSB set (except another acknowledge message) and which passes
all other checks, including the CRC. The acknowledge message format is shown below.
Data Description
A546 Message
header
0E
Message length (14 decimal)
0000000000
Five bytes reserved for future use as a routing address
00
Status byte (always 00)
XX
Function code, echo of acknowledged function code with MSB set.
RR
Response code (see below)
XX
Response number (XX = 00, 01, 02, 03, 00, 01, ...) must match response
number from message being acknowledged.
cccc
Two-byte CRC-16 checkcode for message
The SEL-387E supports the following response codes:
RR
Response
00
Success
01
Function code not recognized
02
Function disabled
Examples
1. Successful acknowledge for "Enable Unsolicited Data Transfer" message from a relay with
at least one of SER1, SER2, or SER3 not set to NA:
A5 46 0E 00 00 00 00 00 00 81 00 XX cc cc
(XX is the same as the Response Number in the "Enable Unsolicited Data Transfer"
message to which it responds.)
2. Unsuccessful acknowledge for "Enable Unsolicited Data Transfer" message from a relay
with all of SER1, SER2, and SER3 set to NA:
A5 46 0E 00 00 00 00 00 00 81 02 XX cc cc
(XX is the same as the response number in the "Enable Unsolicited Data Transfer"
message to which it responds.)
3. Disable Unsolicited Data Transfer message, acknowledge requested:
A5 46 10 00 00 00 00 00 01 02 C0 XX 18 00 cc cc
(XX = 0, 1, 2, 3)
4. Successful acknowledge from the relay for the "Disable Unsolicited Data Transfer" message:
