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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 & address

View part page · 3 devices with a published DIP scheme

Valid range 0–31

Switch bank S1 · MR52-S3 Reader Interface Address 13

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

S1 (1) + S3 (4) + S4 (8) = 13

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 J4 (not on the DIP bank): install on first and last unit only.

Source: Mercury PLT-05248 Rev A.5, "MR52-S3 Reader Interface Installation and Specifications", switch table p. 11 (§2.8); termination p. 6, p. 10. 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.