Arduino Mega 2560¶

Connection¶

These connections are required between the Arduino Mega 2560 and the IEEE488 connector:

Arduino	GPIB connector	Function
A0	1	DIO1
A1	2	DIO2
A2	3	DIO3
A3	4	DIO4
D8	5	EOI
D7	6	DAV
D6	7	NRFD
D16	8	NDAC
D17	9	IFC
D10	10	SRQ
D11	11	ATN
GND	12	Shield
A4	13	DIO5
A5	14	DIO6
A6	15	DIO7
A7	16	DIO8
D9	17	REN
GND	18,19,20,21,22,23	GND

The layout on the Mega was chosen so as to leave pins A8-A15 and the two rows of pins at the top of the board free for expansion including for displays and other peripherals.

Pins 16 and 17 correspond to Serial2. As these have been used for controlling signals on the GPIB bus, they cannot be used for serial communication. If Serial2.begin is added to the sketch, these pins will be enabled for serial communication and will no longer function as GPIB control signals. In addition to the default serial port (RX0 and TX0), Serial1 and Serial3 are still available for expansion if required. These two pins were chosen for GPIB signals as they belong to port H along with pins 6 – 9.

Wiring diagram - default layout¶

Wiring diagram - layout E1 & E2¶