E10 HostLink Cmd

[ashish]

we r using E10 PLC for a small application.

our user needs to monitor the status of all IOs, on PC, and change a timer value in program written in the controller frequently through PC.

We have provided a PC with VB software. Distance between PC and plc is 30 meters.

Hence we r trying to connct PC serial port to 485 port of controller through auto 485. But, we did not get any response from plc when we execute host link commands.

We have tried with 2 baud rates 9600 and 38400 but it did not work.

We also tried using trilogy 3.5 and with VB sample software provided.

But, it works if we use a programing cable with PC serial port.

Is it possible to do 1 to 1 communication (PC and plc) on 485 port for E10?

[support]

Did you move the jumper to RS485 side when connecting the PLC in RS485 mode to the Auto485? Try to connect the PC, Auto485 and the PLC at the short distance first to get it work before connecting at longer distance.

If this is an E10-npn, remember that pin 2 of the DB9 is RS485 "-" and pin 5 fo the DB9 is RS485+.

[ashish]

no. we did not change the jumper position.

Which jumper we need to change ?

this info is not available in Installation Guide.

in instalation guide it is mentioned that - 485 port is automatically enabled when opto 232 adapter is unplugged from 10pin PTA box header.

any way, pl let me know which jumper we need to change.

we are usign E10 relay plc.

[support]

What I mentioned above are for E10-npn+ and not applicable to E10-Relay+ PLC.

If you are using E10-Relay+ then there is no jumper to select. You must remove the opto232 from its socket when trying to use the RS485.

If RS485 is still not working then you may have a broken RS485 driver which could happens if it is ever accidentally touches the 24V DC voltage directly. You can find a replacement IC such as 75176 from a local electronic component store or you can buy replacement IC by emailing to support@tri-plc.com.

[ashish]

ok. i tried out but still there is problem.

is it required to connect a termination resistor when i connect single E10 relay plc to PC through 485 ?

PC to 485 cable which i have prepared is cross cable i.e. 2-3, 3-2, 5-5.

[ashish]

how should be the cable between PC serial port and DB9 connector of Auto 485?

[support]

Termination resistor is not needed for very short cable connection between the PC and the PLC. Termination resistor is need when you connect 100s of feet of twisted pair cable between the end to end.

Auto485 connection: It should be a direct connection via straight thru DB9 cable between the PC serial port and Auto485