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DIP Switch Addressing Tool

Pick the board, enter the address, set the switches. Or click the switches to read one.

Address → switches Switches → address

Device

View part page · 3 devices with a published DIP scheme

Click switches on the bank to match the board in front of you. The address updates as you go.

Address
22
of 0–31
Baud rate
38,400 bps
Encryption
Off

Switch bank S1 · MR16in-S3 Input Processor Address 22

▲ ON▼ OFF
124816BAUDBAUDENC
Reserved, not addressAddress weight ON

S2 (2) + S3 (4) + S5 (16) = 22

S6 ON + S7 ON → 38,400 bps · S8 OFF → no encryption

Before firmware 1.38.1, S6 and S7 both OFF is 2,400 bps. S8 encryption is undefined before that firmware.

Termination: Jumper J3 (not on the DIP bank): install on first and last unit only.

Source: Mercury PLT-05250 Rev A.3, "MR16in-S3 Processor Installation and Specifications", switch table pp. 9–10; termination p. 6. Open install guide

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How DIP switch addressing works

Each module on an RS-485 bus needs its own address so the controller knows who is talking. Mercury boards read that address from switches 1–5 as a binary number.

Every switch has a weight that doubles: S1 = 1, S2 = 2, S3 = 4, S4 = 8, S5 = 16. Turn on the switches whose weights add up to the address. Five switches give 32 addresses, 0–31.

The rest of the bank is not address. On MR52-S3, MR16in-S3 and MR16out-S3, S6 and S7 set baud rate and S8 turns on encryption. Termination is a separate jumper on each board.

FAQ

How do I set a Mercury MR52 address?Switches 1–5 set the RS-485 address, 0–31, in binary: S1 = 1, S2 = 2, S3 = 4, S4 = 8, S5 = 16. Add the weights of the switches that are ON. Address 13 is S1 + S3 + S4.
What do switches 6, 7 and 8 do?On MR52-S3, MR16in-S3 and MR16out-S3, switches 6 and 7 set baud rate (both ON = 38,400 bps) and switch 8 turns on encrypted communication. They are not part of the address.
Where is RS-485 termination set?Not on the DIP bank. Each board has a termination jumper (J4 on MR52-S3, J3 on MR16in-S3, J1 on MR16out-S3). Install it on the first and last unit on the bus only.
Can two modules share an address?Not on the same RS-485 port. Each port is its own bus, so a second port can start again at address 0.
Why does my module stay offline after I change the switches?Match the address and baud rate in the host software, and check that every board on the bus uses the same baud rate.