User guide

PlantLinc PLR5000 User’s Guide
P/N 161-09888-001 DATA-LINC Group
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Table 5: Maximum Packet Size Settings where RF Data Rate=2
Maximum Setting
0 1 2 3 4 5 6 7 8 9
0
15 36 58 79 100 121 143 164 185 206
1
20 42 63 84 105 127 148 169 190 212
2
26 47 68 90 111 132 153 175 196 217
3
31 52 74 95 116 137 159 180 201 222
4
36 58 79 100 121 143 164 185 206 228
5
42 63 84 105 127 148 169 190 212 233
6
47 68 90 111 132 153 175 196 217 238
7
52 74 95 116 137 159 180 201 222 244
8
58 79 100 121 143 164 185 206 228 249
9
63 84 95 127 148 169 190 212 233 254
(3) Xmit Rate
There are two settings for the Transmit Rate parameter. For normal operation, the PLR5000 should be set at
Transmit Rate 1. Transmit Rate 0 is useful to qualitatively gauge signal strength. When set to Transmit Rate 0
the radio modems will transmit data back and forth continuously, and the strength of the signal may be
gauged by viewing the Show Radio Statistics option.
Because the radio modems transmit continuously when Transmit Rate is set to 0 (whether or not they have
data to send) they use radio frequency spectrum unnecessarily. Therefore, Transmit Rate 0 should be used
only as a diagnostic tool and not for normal operation.
(4) RF Data Rate
The PLR5000 has two settings for the RF Data Rate (not to be confused with the RS232 Baud Rate). Setting 2
(50.1 Kbps) should be used when the radio modems are close together and data throughput is to be optimized.
Setting 3 (38.4 Kbps) should be used when the radio modems are farther away and a solid data link is
preferred over data throughput.
Note: The RF Data Rate setting must be identical for all units in the system. Any radio modem with a
different RF Data Rate than the Master will not establish a communication link.