Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 389)

Channel Configuration
16-11
Parameters for DF1 Half-Duplex Limited Master
Parameter Description
Baud Rate Communication speed in bits/second. Toggle baud rates
from 110 to 19200.
Stop Bits Toggle Stop Bits setting to 1, 1.5, or 2.
Duplicate Detect Toggle between Enabled and Disabled. When Enabled, the
processor will detect and ignore duplicate message packets.
ACK Timeout (x 20 ms) Enter a number between 1 and 65535 to set the amount of
time the processor will wait for an acknowledgment of its
message transmission. For a one second timeout, enter the
number 50. (50 x 20ms = 1000ms = 1 second)
Message Retries Enter the number of times the processor should resend a
message to the master without getting an acknowledgment
and stopping. Valid range is 0-255.
Control Line Select No Handshaking for direct point-to-point
communication (without a modem). If you are using a
modem, you have two options. Select Full-Duplex if both
the master and slave have a full duplex modem. Select Half
Duplex Without Constant Carrier if the master and slave are
both using half duplex modems.
Polling Mode Toggle to the desired polling mode.
Priority Polling Range Enter the low and high addresses to set the range for priority
polling when the Polling Mode is set to Standard. Valid
addresses are from 0 to 254. If you set the Low parameter
greater than the High parameter, the polling range is
disabled.
Reply Message Wait
Time (x 20 ms)
Enter the amount of time the Master will wait before polling
for a reply to a command it has sent.
Parity Toggles between Even and None to determine whether the
parity bit is used in the communication packets.
Station Address Enter the station address. Valid range is 0-254 decimal.
Error Detect Toggles between BCC and CRC for the error detection
mode. CRC, the default, will detect virtually all errors. BCC
is less stringent and may miss some errors that CRC
detects, but BCC may be easier to implement. Use CRC
whenever possible.
RTS off Delay (x 20 ms) If you are using a half-duplex communication device, you
may need to delay turning off the RTS (request to send)
signal to make sure the last characters are sent. Valid
range is 0-65535.