Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 56)

3-18 Configuring the Module
Figure 3.18 Example RTU Format HIM Screen for CH1 Drives
2. Reset the module (see Resetting the Module on page 3-20 ).
Setting the RTU Rx Delay Time
1. Set the values of Parameters 16 - [RTU Rx Delay 1], 31- [RTU Rx
Delay 2], and 46 - [RTU Rx Delay 3] to establish the inter-character
delay time that detects the end of a receive packet for the respective
channel.
Figure 3.19 Example RTU Rx Delay HIM Screen for CH1 Drives
2. Reset the module (see Resetting the Module on page 3-20 ).
Setting the RTU Tx Delay Time
1. Set the values of Parameters 17 - [RTU Tx Delay 1], 32- [RTU Tx
Delay 2], and 47 - [RTU Tx Delay 3] to establish the inter-frame
delay time that delays the sending of a transmit packet for the
respective channel.
Value Format
0 8-N-1 (default)
1 8-E-1
2 8-O-1
3 8-N-2
4 8-E-2
5 8-O-2
RTU Format 1
Parameter: # 015
0
VALUE LIMITS SEL
Default: 0 milliseconds
Minimum: 0 milliseconds
Maximum: 500 milliseconds
RTU Rx Delay 1
Parameter: # 016
0
VALUE LIMITS SEL
TIP: If the Modbus RTU slave is a PowerFlex 4-Class drive, set the
value of [RTU Rx Delay x] to 2 milliseconds when the value of
[RTU Baud Rate x] is 19200.