Automate ValveLink 8 Gebruikershandleiding - Pagina 11

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Serial Communications

All of AutoMate's controllers are capable of communicating

with a host computer connected to a chain of several devices. Serial

communications must be set to either 9600 or 4800 baud (see Mode

8), and must be sent over a standard null modem cable. Usually this

is a normal serial cable with a null modem adapter

Null modem cable diagram

AutoMate has im ple ment ed a com mu ni ca tions pro to col com-

pat i ble with the one offered by Axon In stru ments. All com mands

begin with ATn, where n is a single digit from 0-9, indicating the

device num ber being addressed. The address is set with the Serial

Address switch on the rear of the ValveLink. All com mands must

be ter mi nat ed with a car riage return <cr>. Possible commands are:

ATnO<cr>

- Open ALL valves.

ATnC<cr>

- Close ALL valves.

ATnV+v<cr> - Open valve 'v'.

ie. AT6V+3<cr> opens valve 3 on device 6.

ATnV-v<cr> - Close valve 'v'.

ie. AT5V-1<cr> closes valve 1 on device 5.

All valve and mode numbers are 1 based instead of 0 based. That is, on a

ValveLink8, they range from 1-8, and ValveLink16 valves range from 1-16.

ATnM+x,x/y,...<cr> - Activate (turn on) modes.

ATnM-x,x/y,...<cr>

- Deactivate (turn off) modes.

1 (ground)

All modes are separated by commas. The modes that re-

quire pa ram e ters (4 & 5) have them specifi ed following a forward

slash, but pre ced ing the com ma that sep a rates the next entry. For

example, AT3M+2, 4/11, 5/3, 6<cr> ac ti vates modes 2, 4, 5 and 6 on

device 3, with valve 11 specifi ed for mode 4 (preselect), and valve 3

specifi ed for Master mode (5).

Again, all valves are referred to start ing with 1.

The modes for purposes of serial commands are:

1 - 'Straight through' TTL mode. The individual TTL Inputs turn

valves on or off. This is incompatible with modes 2, 3, & 4; mode 1

turns them off.

2 - 'Low-bank' Binary Addressing mode. Inputs 1-3 are decoded as a

binary number if the fourth TTL Input is low. Turns off mode 1.

3 - 'High-bank' Addressing mode. Inputs 1-3 are decoded as a bi-

nary number if the fourth TTL Input is high. Turns off mode 1.

4 - Preselect mode. TTL Input 8 turns the preselected valve on or off.

Requires a valve number parameter. Turns off mode 1.

5 - Master mode. Requires a valve number parameter.

6 - One-at-a-Time mode.

The baud rate (Mode 8) may not be changed via the serial com-

mands for obvious reasons.

See pages 13-15 for a complete description of these modes.