Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration
599
Message-Based Polling Mode Channel Configuration
When the system driver is DF1 Half-Duplex Master, the following
parameters can be changed:
DF1 Half-Duplex Master Configuration Parameters
Parameter
Options
Programming
Software
Default
Channel
MicroLogix 1400: Channel 0
0
Driver
DF1 Half Duplex Master
Baud Rate
300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K
19.2K
Parity
none, even
none
Node Address
0…254 decimal (255 is reserved for broadcast)
1
Control Line
No Handshaking, Half-Duplex Modem (RTS/CTS Handshaking), Full-Duplex Modem (RTS on)
No Handshaking (485 Network)
No
Handshaking
Error Detection
CRC, BCC
CRC
Duplicate Packet
Detect
enabled, disabled
Detects and eliminates duplicate responses to a message. Duplicate packets may be sent under
noisy communication conditions if the sender’s Message Retries are set greater than 0.
enabled
RTS Off Delay
(x20 ms)
0…65535 (can be set in 20 ms increments) – only with control line set to “Half Duplex Modem
(RTS/CTS Handshaking)”
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.
0
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