Publication 1764-UM001B-EN-P - April 2002
Communication Connections 4-3
Connecting to the RS-232
Port
DF1 Full-Duplex Communication Parameters
When a communication channel is configured for DF1 Full-Duplex,
the following parameters can be changed.
Making a DF1 Full-Duplex Point-to-Point Connection
You can connect the MicroLogix 1500 programmable controller to
your personal computer using a serial cable from your personal
computer’s serial port to the controller, as shown in the illustrations
below.
Table 4.2 DF1 Full-Duplex Configuration Parameters
Parameter Options Default
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K 19.2K
Parity none, even none
Source ID (Node
Address)
0 to 254 decimal 1
Control Line no handshaking, Full-Duplex modem
handshaking
no
handshaking
Error Detection CRC, BCC CRC
Embedded Responses auto-detect, enabled auto detect
Duplicate Packet
(Message) Detect
enabled, disabled enabled
ACK Timeout 1 to 65535 counts (20 ms increments) 50 counts
NAK retries 0 to 255 3 retries
ENQ retries 0 to 255 3 retries
Stop Bits not a setting, always 1 1
ATTENTION
!
Chassis ground, internal 24V ground, user 24V dc
ground, and RS-232 ground are internally connected.
You must connect the chassis ground terminal screw
to ground prior to connecting any devices. It is
important that you understand your personal
computer’s grounding system before connecting to
the controller. An optical isolator, such as the
1761-NET-AIC, is recommended between the
controller and your personal computer when using
Channel 0. An isolator is not required when using
Channel 1 (1764-LRP).
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