1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

600 Protocol ConfigurationDF1 Half-Duplex Master Configuration ParametersParameter Options ProgrammingSoftwareDefaultRTS Send Delay(x20 ms)0…65535 (can be set in 20 ms increments) – only with control line set to “Half Duplex Modem(RTS/CTS Handshaking)”0Message Retries 0…255Specifies the time delay between setting RTS until checking for the CTS response. For use withmodems that are not ready to respond with CTS immediately upon receipt of RTS.3Pre Transmit Delay(x1 ms)ACK Timeout(x20 ms)Specifies the number of times the master device attempts to re-send a message packet when itdoes not receive an ACK from the slave device. For use in noisy environments whereacknowledgements may become corrupted in transmission.0…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 2 ms of delaytime to change from transmit to receive mode.When the Control Line is set to “Half-Duplex Modem (RTS/CTS Handshaking)”, this is theminimum time delay between receiving the last character of a packet and the next RTS assertion.0…255 (can be set in 20 ms increments)Specifies the amount of time the master will wait for an acknowledgement to a message it hastransmitted before it retries the message or errors out the message instruction.050Reply MSG Timeout(x 20 ms)Priority PollingRange – HighPriority PollingRange – LowNormal PollingRange – HighNormal PollingRange – LowNormal Poll GroupSizeThis timeout value is also used for the poll response timeout.0…255 (can be set in 20 ms increments) – only with MSG-based Polling ModesSpecifies the amount of time the master will wait after receiving an ACK to a master-initiatedMSG before polling the slave station for its reply.Select the last slave station address to priority poll – only with Standard Polling Modes. 0Select the first slave station address to priority poll. Entering 255 disables priority polling – onlywith Standard Polling Modes.Select the last slave station address to normal poll – only with Standard Polling Modes. 0Select the first slave station address to normal poll. Entering 255 disables normal polling – onlywith Standard Polling Modes.Enter the quantity of active stations located in the normal poll range that you want polled during ascan through the normal poll range before returning to the priority poll range. If no stations areconfigured in the Priority Polling Range, leave this parameter at 0.12552550Publication 1766-RM001A-EN-P - October 2008