Echelon LonWorks Router - Manual (Page 117)

mode = READ_ONLY_RELATIVE (1)
offset = 0x0019;
count = 1;
form = BOTH_CS_RECALC (1)
data = buffer_sizes;
The buffer_sizes value contains two nibble fields that control the size of both
the input and output buffers. The output size value also controls the priority
output buffer size. The default size is 66 bytes (or SIZE_66 = 0xB).
When changing this value, you should set both nibble fields to the same value.
Different values can be used if the maximum packet size is different for the two
directions through the router. The default setting for this byte is 0xBB. The
total number of bytes assigned to the buffer queues for a RTR-10 must not exceed
1254 bytes, as described in Message Buffers. A buffer size of less than 66 is not
recommended because the router will not be able to forward network
management messages if the buffers are too small.
The size values are represented by a code of type buffer_size_entry:
typedef enum {
SIZE_20 = 0x2;
SIZE_21 = 0x3;
SIZE_22 = 0x4;
SIZE_24 = 0x5;
SIZE_26 = 0x6;
SIZE_30 = 0x7;
SIZE_34 = 0x8;
SIZE_42 = 0x9;
SIZE_50 = 0xA;
SIZE_66 = 0xB;
SIZE_82 = 0xC;
SIZE_114 = 0xD;
SIZE_146 = 0xE;
SIZE_210 = 0xF;
SIZE_255 = 0x0;
} buffer_size_entry;
Set Priority Output Buffer Queue Count
The priority output buffer queue count is selected using a Write Memory network
management message with the following parameters:
mode = READ_ONLY_RELATIVE (1)
offset = 0x001A;
count = 1;
form = BOTH_CS_RECALC (1)
data = queue_count;
The queue_count value contains two nibble fields. The most significant nibble
controls the number of priority output buffers. The least significant nibble must
be zero. The total number of bytes assigned to the buffer queues for a RTR-10
must not exceed 1254 bytes, as described Message Buffers.
The most significant nibble of queue_count is represented by a code of type
queue_count_entry
:
L ON W ORKS Router User’s Guide 107