Ethernet Modbus Gateway 2

1 year ago

Open source license: Public Domain

Project source: Cloned from Ethernet Modbus Gateway

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Description

Second iteration. First version worked fine but decided I needed a factory reset switch and LED's moving to end of PCB.

Designed to fit exactly in "VG-AL53" aluminium enclosure (google it) these are about $7 on aliexpress.

Works with Microchip TCP Lite stack. Firmware is very close but not yet complete.

I have attached the MPLABX XC8 project in a semi-working state below. Basically it is forwarding everything from ethernet to serial but I cannot test the other way until I get my MODBUS slave device setup. I will update this when status goes to finished.

Note the chip works well but is only really suitable for baud rates up to 9600 which is what I am testing it at and what it will be used at. Stack is also only half-duplex, again this is fine due to the 2-wire RS485 which can only transmit or receive but not both.

There are multiple compiler warnings for the Microchip TCPIP Lite stack when this compiles with XC8 but I have left it on test for several hours transferring at full speed and pinging at the same time and it was fine.

Documents

Schematic copy

Open in editor

New PCB copy

Open in editor

BOM

ID Name Designator Footprint Quantity Mounted
1 HR911105A RJ45 RJ45-LIGHT 1 Yes
2 PIC18F67J60-I/PT U1 TQFP-64_10X10X05P 1 Yes
3 MB2S D1 BRIDGE-MBS 1 Yes
4 100 C1,C6,C7,C8,C9,C10,C11,C15,C16,C20,C25,C26 0805 12 Yes
5 1uf C3 C1210 1 Yes
6 ss34 D2 SMA-DIODE 1 Yes
7 25MHZ X1 OSC-49OSC-YSX-1 1 Yes
8 27 C12,C13 0805 2 Yes
9 390Ω R1,R2 0805 2 Yes
10 10uF 6.3V C14 0805 1 Yes
11 10K R9,R12 0805 2 Yes
12 ICSP J1 1X05_LOCK 1 Yes
13 1K R10,R4,R6 0805 3 Yes
14 390 R11 0805 1 Yes
15 PWR5V LED1,LED2,LED3 1206 3 Yes
16 49.9R 1% R13,R14,R15,R16 R0603 4 Yes
17 120Ω L1 1206 1 Yes
18 2.26K 1% R17 0805 1 Yes
19 24V JP1 WJ2EDGRC-5.08-2P 1 Yes
20 SWITCH-3x6x2.5_SMD FACTORY-RST SWITCH-3X6X2.5_SMD 1 Yes
21 MP2451DT-LF-Z U5 SOT-23-6 1 Yes
22 10u C5,C17 C1210 2 Yes
23 4.7uH H1 TDK CLF6045NI-D 1 Yes
24 4.7uF/50V C18 1210 1 Yes
25 33 C21 0805 1 Yes
26 SN6501DBVR U4 SOT-23-5 1 Yes
27 760390014 U7 WURTH 760390014 1 Yes
28 1N5819G-CA2-R D3,D4 SOD-123FL 2 Yes
29 1u C19,C22,C2 C1210 3 Yes
30 100nF C23,C4 C0805 2 Yes
31 10uF C24 1206 1 Yes
32 LP5907QMFX-3.3Q1 U3 SOT-23-5 1 Yes
33 MAX14858 U6 SOIC-16W 1 Yes
34 120 RTERM R0805 1 No
35 SM712.TCT D5 SOT-23(SOT-23-3) 1 Yes
36 10Ω R21,R22 0805 2 Yes
37 RS485 JP2 WJ2EDGRC-5.08-2P 1 Yes

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