GatesAir Intraplex DS-64NC Installation And Operation Manual page 30

DS-64NC Synchronous Data Module
Version 9.1
Table 2-11. Remote Status Messages – S Codes (continued)
S
Codes Digit(s)
S3 B00000000
↑↑↑ ↑↑↑ ↑↑
B00000000
↑↑↑ ↑↑
S4
B00000000
↑↑↑------
* There is a brief (1-2 mS) delay after issuing a SET command before the common module
updates the status codes. If you have network software, you should allow for this delay when
issuing a STATUS? query after selecting a performance register.
S Code Reading for Performance Registers
S3 represents the contents of the currently selected performance register (Table 2-11). Five of the
seven registers (overrun, underrun, and error counts) have a simple counter. Either the decimal or
binary representation may be useful. These counters saturate at 255; if the count goes higher,
they continue to read 255 until they are reset. The other two performance registers show the
current transmit- and receive-side FIFO buffer depths. These FIFOs have a maximum depth of
12,000 bits. In order to derive this number, look at the binary value of S3 and separate the digits
into two four-digit binary numbers, like this example: B00000000
For example, suppose S3 reads
decimal value of n: n =
simply take the value 2
n+1
2 (Table 2-12). In this example, where n is
somewhere between 256 bits and 511 bits.
2-18
Value
Any Performance register value. Shows the contents of the currently selected
8-digit performance register (Section 2.8.2.2 - .
binary
number
Indicates which performance register is currently selected:*
00000 Current receive FIFO depth
00001 Receive FIFO underrun count since last reset
00010 Receive FIFO overrun count since last reset
00011 Receive bit error count since last reset
10000 Current transmit FIFO depth
10001 Transmit FIFO underrun count since last reset
10010 Transmit FIFO overrun count since last reset
0 Not currently used; will always read "0"
. In this case, n is
B10000101
(binary) = 8 (decimal). To get a rough estimate of the FIFO depth,
1000
n
. The actual depth is somewhere between the value of 2
Description
n f
, and f is
1000
, the table shows that the FIFO depth is
1000
2 – Functional Description
. Calculate the
0101
n
and the value of
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