PlantLinc
PLR5000 User’s Guide
P/N 161-09888-001
DATA-LINC
Group
14
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.
