Solartron Mobrey 3595 4C, User Manual

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3595 4C User Manual Part One Programming the 3595 4C Interface card
35952350 (CH03/AA)
3-17
3.5 Receiving IMP results and responses
Measurement results from IMP devices are received on RAM pages 2 though 51, which are assigned to
IMP 1 through 50 respectively. Each of these pages contains the data, organised as shown in Table 3.1.
Sections 3.5.1 through 3.5.4 describe each type of data.
Table 3.4: Content of RAM pages 2 through 51
Location Addresses * Function
000 – 04F (r/w) Data stream 0 (80 bytes)
070 – 073 (r/w) Data stream 1 (4 bytes)
080 – 0EF (r/w) Data stream 2 (112 bytes)
0F0 – 0FB (r/w) Data stream 3 (12 bytes)
0FC – 0FF (r) Unallocated
0FF (w) Page address
100 – 101 (r/w Stream 0 size
102 – 103 (r/w) Stream 1 size
104 – 105 (r/w) Stream 2 size
106 – 107 (r/w) Stream 3 size
108 – 109 (r/w) Stream 0 time tag
110 – 117 (r/w) Stream 1 time tag
118 – 11F (r/w) Stream 2 time tag
120 – 127 (r/w) Stream 3 time tag
128 (r/w) Unallocated
129 (r/w) Transmit retry count
12A – 1FF (r/w) Unallocated
*
Remember to add the base address of card to these
hexadecimal numbers.
3.5.1 Data streams
IMP devices are able to return four types of data, each type having a particular format. To allow application
software to categorise and attach different priorities to the data types, the S-Net protocol segregates them
into four data streams. The data-to-stream assignments are listed in Table 3.5, together with size of the
buffers that accommodate them.
Table 3.5: Data-to-Stream assignments
Stream No. Data Conveyed Buffer Size
0 Measurement scan or long numeric response 80 bytes
1 Single channel measurement or short numeric response 4 bytes
2 Event information (3595 2A and 3595 2B IMP only) 112 bytes
3 Command responses in ASCII 12 bytes
NOTE: In response to the SA command (‘Save set-up data’ – see Chapter 1 in Part 2 of this manual), more
than 80 bytes may be sent in Stream 0 by an IMP. This may overwrite the boundaries of the area reserved
for Stream 0 in the (on-card) buffer space. Stream 0 for the 3595 2B switch-pod is 128 bytes wide.
(Therefore, this pod does not use Stream 1.)