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(high = ValveLink in Mode 2 & low = ValveLink in Mode 1). As

in Mode 1, TTL inputs 0-3 are used for addressing and no longer

directly control their respective valves. Example: TTL input 0000

1001 opens valve 9 (valve 1 on the second ValveLink8.)

Pre-selected Valve Mode

When Mode 3 is activated, the user is prompted to

press a button 0-7 immediately after leaving mode selection (all

LEDs will fl ash waiting for a single push button selection). There-

af ter, the valve selected is toggled on and off by TTL input bit #7.

This mode allows a researcher to permanently connect a single TTL

output to ValveLink input seven, and select which of eight valves to

activate with that single TTL signal. This mode prevents input #7

from controlling valve #7 as it normally would, unless valve #7 is

chosen as the 'pre-selected' Mode 3 valve.

Master Valve

When Mode 4 is selected, the user is prompted to

press a button 0-7 immediately after leaving mode selection (as

Mode 3). This valve then becomes the master valve. Thereafter,

whenever all other valves have been closed through push buttons,

TTL inputs, or the serial port, the master valve will automatically

open. This feature is useful if a control solution is required when-

ev er all other solutions are stopped.

One-at-a-time Mode

When active, Mode 5 automatically closes all other

valves whenever a valve is opened – either by push button, TTL

input, or serial input. This guarantees that no more than one valve

is open at a time. The only exception to this mode is an All Open

command through the serial port (code 192).

4800 Baud

The ValveLink normally expects serial com mu ni c-

a tions at 9600 baud. When Mode 7 is active, the ValveLink listens

for serial codes at a slower 4800 baud rate.

While several modes decode the TTL inputs, the push buttons

and serial input will always toggle valves according to which modes

are active. Remember button #0 leaves mode setting. If Modes 3

and 4 are both active, the user will be prompted for the Mode 3 'pre-

se lect ed' valve fi rst, then the Mode 4 'master' valve.

Multiple modes

As mentioned above, most of the six modes above can be active

concurrently, such as Mode 1 - Addressing, Mode 4 - Master Valve,

and Mode 5 - One-at-a-time. Valves are opened or closed ac cord -

ing ly. Only Modes 1 and 2 cannot both be on simultaneously.

Example mode selection LED's (red = off, green = on):

Blink

Off

0 blinking = mode select - press button #0 to leave

2 on = Addressing Mode valves 8-15 (2nd ValveLink8)

4 on = Master Valve

5 on = One-at-a-time Mode

7 on = 4800 baud serial rate

In this example, when button #0 is pressed to leave mode selec-

tion, all LEDs will fl ash waiting for the master valve (Mode 4) to be

selected.

Instant mode select

In order to ease mode selection, especially when the ValveLink

is frequently turned on and off, individual modes can be selected

when power is turned on. Just as button #0 is held to enter mode

selection described earlier, instead simply hold down the button

correspon ding to the mode to be activated during power on or reset.

It is not necessary to press anything to 'leave' or fi nish instant mode

se lec tion. Only one mode can be activated in this manner at a time.

However, button #6 activates the frequently used combination of

Modes 4 & 5 (master valve and one-at-a-time).

As described under Mode Selection, Modes 3, 4 and 7 each

require specifi c valves to be designated for their function. The user

will be prompted with all LED's fl ashing to select a 'pre-desig-

nated' or 'master' valve after using instant selection for any of these

modes.

Off