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General Category => General Discussion => Topic started by: Sarcio on December 01, 2023, 08:47:57 PM

Title: 9 Pin/15 Pin RS485
Post by: Sarcio on December 01, 2023, 08:47:57 PM

 Hello everyone,

 I am programming a Panasonic WHS1 HMI (9 pin serial port) and a DL262 CPU (15 pin serial port). I plan to use RS485/MODBUS for communication between the two, but I'm not sure how to wire the cable so these two will talk. I have attached a pin-out diagram for each device.

 Any pointers on how to wire the plugs for these devices would be greatly appreciated.

Title: Re: 9 Pin/15 Pin RS485
Post by: rlp122 on December 02, 2023, 10:48:54 PM

SD to Pin 2 on 262
RD to Pin 3 on 262
SG to pin 7 on 262
jumper pins 4 & 5 on 262

Title: Re: 9 Pin/15 Pin RS485
Post by: Sarcio on December 03, 2023, 03:40:44 PM

 The connections you specified will work for RS232. My hope is to use RS485. Any suggestions?

 Apologies for the confusion.

Title: Re: 9 Pin/15 Pin RS485
Post by: rlp122 on December 05, 2023, 04:51:34 PM

TXD + to RXD + to RS485 +
TXD - to RXD - to RS485 -
RTS+ to CTS+
RTS- to CTS-

Title: Re: 9 Pin/15 Pin RS485
Post by: Sarcio on December 06, 2023, 05:23:49 PM

Thanks. I'll try that.

Title: Re: 9 Pin/15 Pin RS485
Post by: Sarcio on December 08, 2023, 09:48:50 PM

rlp122: Thanks for the help. I wired it up, but am having trouble getting the (Direct Logic) plc and (Panasonic) hmi to talk to each other. Any ideas?