Delta RMC151 - Manual (Page 432)

RMC70/150 and RMCTools User Manual
order of the bytes in this 16-bit value is determined
by the Byte Order field.
14-15 00 00 Reserved. Must be zero.
16-… … Data. The values of each register to write should
follow the above header. Each 32-bit value is encoded
in either LSB- or MSB-first byte order, as determined
by the Byte Order field. For LSB-first byte order, the
value 16#11223344 should be encoded as 44 33 22
11. For MSB-first byte order, this would be encoded
as 11 22 33 44.
The RMC will respond to this request with the following packet:
Offset Data
(hex)
Description
0-1 06 00 Packet Length. Indicates the total length in bytes of
this packet, excluding this 2-byte field. This 16-bit
value is encoded with the least significant byte first.
2-3 00 02 Static Values. These bytes will always have these
values in the response.
4-5 nn nn Transaction ID. This value will echo the Transaction
ID in the request. It can be used to match this
response to the corresponding request.
6 95 -or- 55 Function Code (Response). If the write was
processed successfully, this byte will be 95, otherwise
it will hold 55.
7 nn Response Code. Indicates whether the write was
successful or not. See the DMCP Response Codes
section below.
Reading Data from the RMC:
To read one or more registers from the RMC, send the following request packet to the
RMC:
Offset Data
(hex)
Description
0-1 0C 00 Packet Length. Indicates the total length in bytes of
this packet, excluding this 2-byte field. This 16-bit
value is encoded with the least significant byte first.
2-3 00 02 Static Values. These bytes must always hold these
values.
4-5 nn nn Transaction ID. This value is simply echoed by the
RMC in its response packet. It can be used to match
responses with requests.
6 14 Function Code. This byte must be 14 in a read
request.
7 nn Byte Order. Determines the byte order for the
Starting Address fields, the Read Count field, and the
Data registers in the response. Notice that the Packet
Length byte order is not affected by this field.
• Least-Significant Byte (LSB) First (00). For
example, the value 0x1122 will be encoded as 22
11.
412 Delta Computer Systems, Inc.