EIA-485 to RS232 ?

[bwen]

Help needed on how to download program from PC (RS232 serial port) to SEL-551 relay.

I have the following.

SEL-551 overcurrent relay with EIA-485 serial port (DB9 Female)
1 - +TX
2 - -TX
3 - N/C
4 - +IRIG-B
5 - SHIELD
6 - -IRIG-B
7 - +RX
8 - -RX
9 - SHIELD

Multilin RS232/485 converter C1450110
RS232 (DB9 Female)
RS485 (2 Wires, "+" and "-")

 

[tom baker]

I would try the same question at MRPLC.NET. Its the Mike Holt forum for PLCs.

 

[bwen]

Thanks, but the website seems inactive

Thanks, but the website seems inactive

Thanks, but the website seems inactive

 

[jdsmith]

Help needed on how to download program from PC (RS232 serial port) to SEL-551 relay.

I have the following.

SEL-551 overcurrent relay with EIA-485 serial port (DB9 Female)
1 - +TX
2 - -TX
3 - N/C
4 - +IRIG-B
5 - SHIELD
6 - -IRIG-B
7 - +RX
8 - -RX
9 - SHIELD

Multilin RS232/485 converter C1450110
RS232 (DB9 Female)
RS485 (2 Wires, "+" and "-")

Here is the note from the SEL online configuration page that tells you how to configure the relay if you order it with only an EIA-485 port

(3) Warning - EIA-485 is for special applications only. SEL strongly recommends ordering an EIA-232 port. If an EIA-485 port is ordered, SEL strongly recommends cable C671A to allow relay programming and event retrieval. All SEL-551 relays ordered with an EIA-485 port are shipped with a C675 Terminal Adapter to adapt from the on board DB-9 connector to an 8-pin screw terminal.

I would suggest you order the SEL #C671 cable. Incidentally, this is one of the reasons I do not allow any new SEL-500 series relays in the plant - they only have one communication port and I want one port avaialble for local programming and another port to connect to a SCADA system. The only exception is we do use SEL-587Z relays, but they are unique and they have multiple communication ports available.