Omron DDAA1000/SRM 30

DATA-LINC GROUP

30 PN 161-09981-002C

rev 8/04

DDAA1000/SRM User Guide

Table 6: Maximum Packet Size Settings where RF Data Rate=2

0 1 2 3 4 5 6 7 8 9

051638597001121341461581602

102243648501721841961091212

262748609111231351571691712

313254759611731951081102222

4638597001121341461581602822

5243648501721841961091212332

6748609111231351571691712832

7254759611731951081102222442

88597001121341461581602822942

9364859721841961091212332452

(3) Xmit Rate

There are two settings for the Transmit Rate parameter. For normal operation the DDAA1000/SRM 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.

Due to the fact that 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 DDAA1000/SRM has two settings for the RF Data Rate (not to be confused with the RS232 Baud Rate). Setting 2

should be used when the radio modems are close together and data throughput is to be optimized. Setting 3 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.