I/O Port Address
The I/O port address are &H278-27F or &H2F8-2FF selectable:
278/2F8 : Output A/D channel number. (low nibble)
279/2F9 : Input A/D low byte data. (8 bits)
27A/2FA : Input A/D high byte data. (low nibble)
27B/2FB : Clear A/D register.
27C/2FC : A/D conversion loop. (low)
27D/2FD : A/D conversion loop. (high)
27E/2FE : Output D/A low byte data. (8 bits)
27F/2FF : Output D/A high byte da ta. (low nibble)
Jumper Settong
1. I/O Port Address
JP1 is used to select port address.
12-Bit A/D-D/A aadapter
 1,2 short
 2,3 short
Input A/D low byte data (8 bit)
 H278 H2F8
Input A/D high byte data (8 bit) H279 H2F8
Input A/D high byte data (8 bit) H27A H2FA
Clear A/D Register
 H27B H2FB
A/D conversion loop (low)
 H27C H2FC
A/D conversion loop (high)
 H27D H2FD
Output D/A low byte data (8 bit)
 H27E H2FE
Output D/A high byte data (low nibble)
 H27F
 H2FF

2.Output Voltage Setting
JP2 is used to select voltage setting

3.Input SettingsInput Settings
Type Connector Pin Assignment
Pin
 Function
 Pin
 Function
1
 GND
 14
 GND
2
 D/A OUT
 15
 -5V
3
 +5V
 16
 GND
4
 GND
 17
 A/D Channel 15
5
 A/D Channel 0 18
 A/D Channel 14
6
 A/D Channel 1 19
 A/D Channel 13
7
 A/D Channel 2 20
 A/D Channel 12
8
 A/D Channel 3 21
 A/D Channel 11
9
 A/D Channel 4 22
 A/D Channel 10
10
 A/D Channel 5 23
 A/D Channel 9
11
 A/D Channel 6 24
 A/D Channel 8
12
 A/D Channel 7 25
 -12V
13
 +12V