CGCOLORMAX2 has support for interface circuits by just adding DIP sockets and chips.

The RS232 circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J23 – RS232 (CGCOLORMAX2 connection side)
Pin	Use
1	TX (CGCOLORMAX2 microcontroller side)
2	CTS (CGCOLORMAX2 microcontroller side)
3	RX (CGCOLORMAX2 microcontroller side)
4	RTS (CGCOLORMAX2 microcontroller side)

Note that in the picture the silkscreen printed on the circuit board is a little bit off. This was fixed in Rev 2b. The labels have been printed offset by .1”.

You can select one of the CGCOLORMAX2’s two serial ports for connection to this circuit.

J24 – RS232 (line/cable side)
Pin	Use
1	RS232 RTS
2	RS232 CTS
3	RS232 RX
4	RS232 TX
5	Ground

 

The RS485 circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J11 – A jumper here will enable RS485 line termination.

J12 – RS485 (line/cable side)
Pin	Use
1	+Vin (Connected to J6)
2	RS485 B
3	RS485 B
4	Ground

The CAN circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J22 – CAN (line/cable side)
Pin	Use
1	CANL
2	CANH
3	Ground

 

 

 

Full-size SD card holder on the CGCOLORMAX2.

D4 – Green “Power/Firmware” LED, left of SD card holder.
D5 – Blue SD card access LED on the right of the SD card holder.

Audio/PWM header.

J8 – Stereo audio (PWM) out. Pin1 is PWM1, pin2 is PWM2, pin3 is ground.

J16 (1×6) / J17 (2×3 pattern next to J16, no silk screen label) are PIC32 programming headers.

J18 – extra connections for PS/2 keyboard.

J18 – 1×4 extra keyboard header. A PS/2 keyboard circuit (the CGKEYCHIP1, for example) can be wired to this extra connector.

J18-1	PS/2 clock
J18-2	Ground
J18-3	PS/2 data
J18-4	+5V

J19 – I2C lines for system (RTC) use. J19-1 is SDA, J19-2 is SCL.

J20 – This header is in parallel with the RTC battery if you choose to not use the coin cell but instead use an external clock battery. J20- 1 is positive. J20-2 is ground. The replacement coin cell is a CR2016.

J21 – This is in parallel with the “Power/Firmware” LED and resistor circuit. You can control the LED via MMBasic commands and this connection will let you control an external circuit in parallel with the LED.

There are connections to ground, +5V, and +3.3V in the “sea-of-holes” prototype area for connecting the custom circuits to power.

A bootloader wire jumper in place on a CGCOLORMAX2.

J7 – A jumper in place is for firmware reload. The two connections can be temporarily shorted together with a short piece of solid wire while applying USB power to the board to put the board on bootloader mode.