does anyone know how to connect a cr1000 to a sensor using rs485 full duplex. All I see are half duplex examples.
Marco
When you set ComC5 to full duplex RS485, ComC5 is the transmit pair and ComC7 is the receive pair.
Tx- = C5
Tx+ = C6
Rx- = C7
Rx+ = C8
0V = RG
Hi. To avoid confusion on this, if you have a CR1000X datalogger, then JDavis posts above apply.
If you have a CR1000, it does not natively support RS485 sensors or devices in full or half duplex.
You can add an expansion module to support RS485 by adding the SDM-SIO1A or SDM-SIO4A :-
Hi nsw, a bit confused before seeing your message.What is the difference between MD485 and SDM-SIO Module? Can SDM-SIO Module be used inconjection with AM16/32B?
Hi Thein. You are correct, the MD485 can be used to connect a CS I/O port to another device which is RS485. The SDM-SIO1A or 4A connects the datalogger using the SDM bus : Control ports C1, C2 and C3 on the CR1000. As its a bus, upto 15 of these can be connected to give 15 offf expansion ports. The SDM-SIO1A is not used with the AM16/32B.
Both could be used to give RS485, but the MD485 is more expensive than the SDM-SIO1A. The MD485 tends to be used mainly for communications between multiple dataloggers and a connection to a PC with LoggerNet. The SDM-SIO1A or 4A is not normally used for datalogger to datalogger or PC comms as it does not support PakBus comms.
MD485 will not do full duplex RS485. So, the recommended interface for 1 sensor would be a SDM-SIO1A.
Thanks to all for the response. I hope one day the cr1000 will natively support rs485 full duplex since it appears to have enough com ports.
In the meantime I am going to flip to a cr1000x and avoid extra parts.
Thanks
All