Allen-Bradley MicroLogix 1400 Instruction Manual page 618

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616 Protocol Configuration
Modbus RTU Slave Communications Configuration Parameters
Parameter Options
Channel Channel 0
Driver Modbus RTU Slave
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K
Parity none, even, odd
Node Address 1...247 decimal
Control Line No Handshaking, Half-Duplex Modem (RTS/CTS Handshaking), No Handshaking (485
Network)
Inter-character 0...6553 (can be set in 1 ms increments); 0 = 3.5 character times
Timeout (x1 ms)
Specifies the minimum delay between characters that indicates the end of a message packet.
Modbus Data Table Coils (Discrete outputs, Modbus addresses 0001...4096) range = 3...255, 0 = no file
File Number
Contacts (Discrete inputs, Modbus addresses 10001...14096) range = 3...255, 0 = no file
Assignment
Input Registers (Read Only, Modbus addresses 30001...30256) range = 3...255, 0 = no file
Holding Registers (Read/Write, Modbus addresses 40001...40256) range = 3...255, 0 = no
(Must be Binary or
file
Integer file type)
RTS Off Delay 0...65535 (can be set in 20 ms increments)
(x20 ms)
Specifies the delay time between when the last serial character is sent to the modem and
when RTS is deactivated. Gives the modem extra time to transmit the last character of a
packet.
RTS Send Delay 0...65535 (can be set in 20 ms increments)
(x20 ms)
Specifies the time delay between setting RTS until checking for the CTS response. For use
with modems that are not ready to respond with CTS immediately upon receipt of RTS.
Pre Transmit Delay 0...65535 (can be set in 1 ms increments)
(x1 ms)
When the Control Line is set to No Handshaking, this is the delay time before transmission.
Required for 1761-NET-AIC physical Half-Duplex networks. The 1761-NET-AIC needs 2 ms of
delay time to change from receive to transmit mode.
When the Control Line is set to Half-Duplex Modem, this is the minimum time delay between
receiving the last character of a packet and the RTS assertion.
Stop Bits 1,5,2
7
Data Bits
Publication 1766-RM001A-EN-P - October 2008
When the system driver is Modbus RTU Slave, the following
communication port parameters can be changed:
Programming
Software Default
0
19.2K
none
1
No Handshaking
0
0
0
0
0
0
0
0
1
8