Figure 4-2 Read Digital Parameter Message Exchange; Table 4-4 Digital Parameter Response Format - Honeywell UDC2300 Product Manual

4.3 Read Digital Parameters,
Response format
Example
Figure 4-2 Read Digital Parameter Message Exchange
request
Address
Protocol Field (without checksum)
UDC State and Mode
6 = slave, no change in mode
4 = configuration, read
Data Type Code for Digital
Identifying Code for Algorithm Selection
Placeholder for Data Value
response
No UDC Error
No Change in Status
Monitor
No Alarm
Algorithm Selection Identifying Code
PID-B
NOTE: Change to slave will not be noted until the next message exchange.
44 RS422/485 ASCII Communications Option Product Manual
Table 4-4 lists the response format, with or without checksum, for digital
I.D. codes 128 through 255.
Where:
OO = UDC Type Error (00 = No Error)
SS = UDC Status
M = Mode (Hex – see "Message Exchange")
A = Alarm Data (Hex – see "Message Exchange")
MMM = Identifying Code for Digital Parameter
DDD = Digital Value (always 3 characters)
CS = Checksum (2 digit hex – see "Checksum")
CR = Carriage Return
LF = Line Feed
Table 4-4 Digital Parameter Response Format
Format Type
With Checksum OOSSMA, MMM, DDD, CS CR LF
Without Checksum OOSSMA, MMM, DDD, CR LF
Figure 4-2 is an example of a Read Digital Parameter message exchange;
specifically, read the algorithm selection: digital I.D. code 128 and
maintain or change the UDC state to slave.
Continued
Format
03 , 0204 , 64 , 11 , 128 ,
00 80 C0 , 128
0 ,
CR LF
, 002 CR LF
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