Allen-Bradley PLC-5 User Manual (English)

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Publication 1785-UM012D-EN-P - July 2005

Communicating with Devices on a Serial Link 10-13

User mode char. The character for the mode attention

character (above)

Enter a valid attention character. If the attention character you want to

use is a control character, specify the ASCII equivalent.

When the controller encounters the attention character and the user

mode character, the controller sets channel 0 communication to user

mode. Note that the remote mode change option must be ENABLED.

Serial Settings

Baud rate Communication rate for channel 0

Configure all devices in the system for

the same communication rate

Select 110, 300, 600, 1200, 2400, 4800, 9600, or 19.2k bps.

Parity Parity setting for channel 0

Parity provides additional message

packet error detection.

Select NONE or EVEN.

Bits per character Select the number of bits that make up

a transmitted character.

Select 7 or 8.

Error detect Whether you want error detection set

to BCC or CRC

Select one of the following:

BCC: the controller sends and accepts messages that end with a BCC byte

for error checking. BCC is quicker and easier to implement in a computer

driver.

CRC: the controller sends and accepts messages with a 2-byte CRC for

error checking. CRC is more complete checking

Configure both stations to use the same type of error checking.

Stop bits Match the number of stop bits to the

device with which you are

communicating

Select 1, 1.5, or 2.

Control line Select the mode in which the driver

operates.

Select a method appropriate for your system’s configuration:

If you are not using a modem, choose NO HANDSHAKING.

If you are using a full-duplex modem, choose FULL-DUPLEX.

Option Settings

Station address The node’s address on the DF1 link Enter a valid DF1 station address. Valid station addresses are: 0-376

octal

DF1 retries The number of times a message is

retried before being declared

undeliverable

Enter a valid value 0-255.

RTS send delay The time delay between the time the

RTS is asserted and the beginning of

the message transmission

This time allows the modem to

prepare to transmit the message.

Enter a value 0-255. Limits are defined in 20 ms intervals. For example to

wait 40 ms, type 2. The recommended time elapse is 0, unless you are

using a modem that automatically returns the CTS as soon as it receives

the RTS. If this is the case, enter a delay time to make sure the modem is

able to transmit before it attempts to send the message.

This field Specifies Configure by Doing the Following

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Installation Instructions4 pages

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Allen-Bradley PLC-5 Specifications

General

Programming Software	RSLogix 5
Programming Languages	Ladder Logic
Power Supply	120/240V AC or 24V DC
Communication Ports	DH+, Remote I/O, Ethernet/IP, ControlNet
Operating Temperature	0 to 60°C (32 to 140°F)
Relative Humidity	5 to 95% non-condensing
Memory	Up to 64K words (user program and data)