4/17/2021 10:49 AM | |
Joined: 5/25/2016 Last visit: 7/26/2024 Posts: 1 Rating: (0) |
Hello, I followed your guidance carefully (qwazee and you). Comm lines RS485 2 wires A+, B-. I tried to swap them but it seems wrong, so i swap them back in the beginning. I monitored DONE, ERROR, STATUS bit of Send_P2P instruction, i got Done = 1 for 1 cycle if I request to send data by making REQ to 1. I set MODE RS485 Half Duplex both in hardware configuration & Port_config in programming (Mode = 4). I even try to update firmware of CM 1241 RS422/RS485 to V2.1 & V2.2, but the problem not solve. I use Hyperterminal to monitor buffer send to PC. I still got two redundant bytes 0x01 I don't know why my CM 1241 RS422/RS485 automatically add two bytes 0x01 in the SendBuffer[0] and SendBuffer[1]. Should I change to module CB 1241 RS485? Thank you ------------------------------------------------------------------------------------------ |
Last edited by: alias123 at: 04/17/2021 10:50:20Last edited by: alias123 at: 04/17/2021 10:52:45Last edited by: Jen_Moderator at: 04/19/2021 09:17:53New subject after splitting |
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