Chapter 6. COMMREQ/Data_Init_Comm Programming
82
PACSystems RX3i Genius Communications Gateway
GFK-2892F
COMMREQ #24: Read Data Command
This command is used to read data from a Genius High-Speed Counter. When the data is received, it will be
placed in the CPU memory location specified in the Command Block.
Command Block for the Read Data Command
Address
Command Length
9
A1
No Wait
0
A2
Status Block memory type
70 (%I), 72 (%Q), 8 (%R), 10 (%AI), 12 (%AQ) or 196 (%W)
A3
Status Block offset
Beginning address for the COMMREQ Status Block.
A4
Idle timeout value
0
A5
Max. communications time
0
A6
Command number
24
A7
PROFINET Device number
1-255: The device number of the targeted GCG Genius Gateway.
A8
Genius Device Number
1-29: the SBA of the targeted Genius HSC Device from which data is to be
retrieved.
A9
Deposit Memory Length
This entry tells the CPU how much memory is being allocated to store the
data returned by the Genius device. The value (in bytes or bits) depends
on the memory type selected as the Deposit Memory type in
Address
+10
below.
When a HSC block is configured as a Type A counter, enter 2 for word
memory types or 32 for bit memory types. However, when configured as
a Type B or Type C counter, enter 3 for word memory types or 48 for bit
memory types.
Note that the Read Data Reply Datagram always responds with six bytes
of data. The most significant bytes (Byte 4 & Byte 5) are null. Bytes 0 thru
Byte 3 contain the HSC Data requested.
A10
Deposit Memory type
Enter the code representing the CPU Memory Type where the GCG will
deposit the data obtained from the target Genius Device. Use the same
codes as in 2.
A11
A12
Memory offset,
bytes 1, 2
bytes 3, 4
Starting address within the Deposit Memory type.
(Byte 4 is MSB, Byte 1 is LSB)
A13
Command Code
See Read/Write Data Command Code Table below.
A14
Counter Number
1
–
4
Read Data Reply
Byte
Command Code
See Read/Write Data Command Code Table below.
Byte +1
Counter Number
1
–
4
Bytes 2 -5
Value returned by Command
Code
