MCE18 stands for "Multifunction Can Bus Extension" with 18 connections - why is this module needed? Our displays have four analogue inputs. However, for some applications this may not be enough and you need more inputs.

It makes sense to map this using the flexible Can Bus protocol. For this purpose, the sensors are connected to our MCE18 and sent via CAN bus to the device to be received - e.g. one of our displays.

But even freely programmable control units only have a limited number of inputs. This can be easily expanded with our module and sent directly to the control unit.

Features:
9 analog inputs (0-5V)
6 digital inputs (on/off)
3 digital outputs (on/off LOW SIDE 0.5A) (new in v2!)

Tested with:

- CANchecked MFD28/MFD32/MFD32S
- MaxxECU
- Ecumaster
- LinkECU
- Haltech (emulates an IO Extender A+B or just B)
- Syvecs (coming soon)
- Motec (coming soon)
- AIM

This device is also available without a housing: CFE18 – can switch board

Pin code	designation	description
1	+12V	12V power supply
2	GND	Ground power supply
3	+5V	5V sensor power supply
4	+5V	5V sensor power supply
5	VBUS	5V USB (usually red)
6	D+	D+ USB data (usually green)
7	D	D- USB data (mostly white)
8th	USB GND	USB ground (usually black)
9	D6	Digital input 6
10	AUX4	Digital output 4 (on request!)
11	D0	Digital input 0
12	A1	Analog input 1
13	A2	Analog input 2
14	A3	Analog input 3
15	AUX3	Digital output 3
16	AUX2	Digital output 2
17	AUX1	Digital output 1
18	SGND	sensor mass
19	SGND	sensor mass
20	A0	Analog input 0
21	D1	Digital input 1
22	A6	Analog input 6
23	A7	Analog input 7
24	A4	Analog input 4
25	D5	Digital input 5
26	CANH	Can Bus High
27	CANL	Can Bus Low
28	SGND	sensor mass
29	+5V	5V sensor power supply
30	D4	Digital input 4
31	D3	Digital input 3
32	A5	Analog input 5
33	A8	Analog input 8
34	D2	Digital input 2

– Default CAN Bus Stream –

The input data is queried and transmitted every 50ms (20Hz – changeable). The data is transmitted as "unsigned big endian".

As soon as 12V and ground are connected, the green status LED on the back lights up.
Can Bus ID: 0x700 ( Base Data CAN ID – changeable)

byte	0	1	2	3	4	5	6	7
BaseID	AIN0 0-1023		AIN1 0-1023		AIN2 0-1023		AIN3 0-1023
Base ID +1	AIN4 0-1023		AIN5 0-1023		AIN6 0-1023		AIN7 0-1023
Base ID +2	AIN8 0-1023		bit masked DIN0-6	bit masked AUX1-4	N / A	N / A	device chip temperature	release=4

MCE18 TRI File Download MCE18/CFE18 Tri File
MCE18 DBC File Download MCE18/CFE18 DBC File

The configuration or modification of the Can Stream is described in CFE18 - Can Bus Function Extension .

The analog inputs provide a 10-bit resolution and therefore values from 0 to 1023. The value must be converted in the control unit. All values are "unsigned big endian"

Examples:
5V voltage AIN0
0x700 Byte0+1
Multiplier: 5; divisor: 1023; Offset: 0

or multiplier: 0.004887585533

Exhaust gas temperature (type k) AIN7:
0x702 Byte6+7
Multiplier: 1250; divisor: 1023; Offset: 0

or multiplier: 1.2218963832

Either the individual bytes are used for the digital inputs. Eg DIN6: 0x702 byte 6 or the bit mask at 0x702 byte2

eg DIN6: 0x702 Byte2 Mask:0x40

Here is a little cheat sheet to do the calculations for a MaxxECU: maxxecu-sensor-calculation.xlsx

– hardware –

– pin assignment –

– jumper configuration –

– Default CAN Bus Stream –

– AIN smoothing –

– Control unit / ECU configuration –

– Documentation / Download –

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