About PM866 Modbus RTU error code -7011 question
I use PM866 port 3(cable use TK212A) bridge one DB9 male connect to slave decvice (Phcenix SCK-C-Modbus) test modbus RTU commmunication (point to point)， in CCB MBConnect was valid but MBRead I always got -7011.
I saw error code description but still no ideal, so want to ask everybody how to solve this problem?
I'm not quite sure if TK212A will work for COM3 as a Modbus RTU master. Please find attached the example for connection of COM3 port with custom made cable.
Also see the example of settings for COM3:
- delay of the RTS-signal = 0
- poll time = 0 (some slave doesn't have a diagnostic) --> Most probably -7011 is from that
In order to help you, you have to provide pin numbers of RS232/485 transmitter and pin numbers of your slave.
Regarding TK212 cable - here is the diagram of it
I'm not quite sure about the connection of your slave or RS232/RS485 transmitter. Is it on 2 and 3 of it's DB9 like TK212A is wired?
Look in the documentation for RS232/RS485 where are Rx and Tx pins of it's connector on RS232 side.
May be you have to prepare your own cable.
3 (TD) of AC800 -> Rx of RS232/485
6 (RD) of AC800 -> Tx of RS232/485
Also, put poll time = 0 in AC800M for the slave.
Source: 3BSE036351-600 A