User`s guide

3-11
Installation 3
Input/Output Connections
Input/Output Connections
For coordination with surrounding equipment,
electrical contacts are used.
The input/Output connector is a 14-pin terminal
block connector. Connections are made to the inputs
and outputs using the connector supplied in the
standard accessory package.
The function and pin numbers for each input and
output are as follows.
Operation of the Inputs
To activate an input, you must connect it to ground
or 0 V. This is usually done using a relay output,
with one side connected to 0 V (Pin 1) and the other
side connected to the input. When the output is
closed, the input is connected to 0 V and is activated.
Each of the four inputs are described in detail in the
following pages.
Inputs Outputs
Start/Stop Out # 1
Pause/Resume Out # 2
IN # 1 Out # 3
IN # 2
Pin # Function
1 Ground
2 Start/Stop Input
3 Pause/Resume Input
4 IN # 1 Input
5 IN # 2 Input
6 Out # 3 Output
7 Out # 3 Output
8 Out # 2 Output
9 Out # 2 Output
10 Out # 1 Output
11 Out # 1 Output
12 Gradient Profile Out
13 Gradient Profile GND
14 Not connected
In the Program mode, Stop does
not stop the flow, it only stops
the program from continuing.
The flow will continue with the
flow rate and composition which
existed when the stop input was
activated. The program will re-
start from the beginning when
the contact is opened. At the end
of each operation, the solvent
consumption will be displayed.
In the Dispense mode, the Start
input can be activated with a
pulse.
Not used
1 2 3 4 5 6 7 8 91011121314
305 Input/Output Connector
Start/Stop Input
Pause/Resume
Wait for Input # 1
Activate Input # 2
GND
GND
Gradient
Profile
Inputs to the 305
Outputs contact
from the 305
The Start/Stop Input
The start/stop input is used to start and stop the 305
pump using an external relay contact.
This input is only
activated when
the input changes
from open to
closed or from
closed to open.
The operation for
each mode is
given opposite.
Mode Input Result
Flow Closed Start Flow
Open Stop Flow
Dispense Closed Start Dispense
Open Stop Dispense
Program Closed Start Program
Open Stop Program