eziccc Posted February 25, 2011 Report Posted February 25, 2011 Hi all! I have connected Q06HCPU with QJ71MB91 module as SLAVE! with my PC (citect) as MASTER using MODBUS driver. So I use QJ71MB91 channel 1 RS-232 (switch1=0001, switch2=0751, switch3=0001, switch4=0710, switch5=0201) and "message" from PC is - 01 03 00 00 00 01 84 0A - I think it's correct. But on QJ71MB91 error 7411 happens. What do you think?? Thx.
kaare_t Posted February 26, 2011 Report Posted February 26, 2011 Well the 7411 indicates that you have a CRC problem, hence the communication "works" since the slave is receiving telegrams however this indicates that the incoming telegram has been succesfully received but the CRC does not match. Are you sure that the communication parameters are the same on both the master and the slave?? You are running: 19200, 8E2 in the slave. Does this match the master??
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