Publication 1762-RM001C-EN-P
Protocol Configuration E-7
When the system driver is DF1 Half-Duplex Slave, the following
parameters can be changed:
Table E.3 DF1 Half-Duplex Slave Configuration Parameters
Parameter Options Programming
Software Default
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K 1200
Parity none, even none
Source ID
(Node Address)
0 to 254 decimal 1
Control Line no handshaking, Half-Duplex modem no handshaking
Error Detection CRC, BCC CRC
EOT Suppression enabled, disabled
When EOT Suppression is enabled, the slave does not respond when polled if no message is
queued. This saves modem transmission power when there is no message to transmit.
disabled
Duplicate Packet
(Message) 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 not set to 0.
enabled
Poll Timeout
(x20 ms)
0 to 65535 (can be set in 20 ms increments)
Poll Timeout only applies when a slave device initiates a MSG instruction. It is the amount of
time that the slave device waits for a poll from the master device. If the slave device does not
receive a poll within the Poll Timeout, a MSG instruction error is generated, and the ladder
program needs to re-queue the MSG instruction. If you are using a MSG instruction, it is
recommended that a Poll Timeout value of zero is not used. Poll Timeout is disabled when set
to zero.
3000
RTS Off Delay
(x20 ms)
0 to 65535 (can be set in 20 ms increments)
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
RTS Send Delay
(x20 ms)
0 to 65535 (can be set in 20 ms increments)
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.
0
Message Retries 0 to 255
Specifies the number of times a slave device attempts to resend a message packet when it
does not receive an ACK from the master device. For use in noisy environments where
message packets may become corrupted in transmission.
3
Pre Transmit Delay
(x1 ms)
0 to 65535 (can be set in 1 ms increments)
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 delay
time to change from transmit to receive 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.
0
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