SSI America BINARY SOLVENT DELIVERY MODULE 90-2581 REV B - Manual (Page 40)

A-2
output is at a low logic level. A low logic level is -3.0 to -15 volts and
a high logic level is 3.0 to 15 volts.
A.1.3 Command Interpreter
The pump’s high-level command interpreter receives and responds
to command packets. The pump will not send a message except when
prompted, and it will send a response to every valid command as
described below. The response to an invalid command is “Er/”.
Each command is characterized by a unique two-letter command
code, and only one command can be issued per line. Case is not
important; that is, the command codes “PR” “Pr” “pR” and “pr” are all
equivalent. Response strings sent by the pump are terminated by the
“/” character.
If the pump's response is "Er/", send a "#" to clear any characters
which may be remaining in the command buffer. The pump will
automatically clear all characters in the command buffer after one
second elapses from the time at which the last character of an
incomplete command was sent.
The command packets are as follows:
Command Response Comments
RU OK/ Sets the pump to the RUN state.
ST OK/ Sets the pump to the STOP state.
FLxxx OK/ Sets the flow rate to x.xx or xx.x mL/min where the range
is fixed for the pump head size, i.e., for 0.01 to 9.99
mL/min xxx = 001 to 999, for 0.1 to 39.9 mL/min xxx =
001 to 399.
FOxxxx OK/ Sets the flow rate to xx.xx or xxx.x mL/min where the
range is fixed for the pump head size, i.e., for 0.01 to
10.00 mL/min xxxx = 0001 to 1000, for 0.1 to 40.0 mL/min
xxxx = 0001 to 0400.
FMxxxx OK/ Sets the flowrate to x.xxx mL/min, i.e.,
for 0.001 to 9.999mL/min xxxx = 0001 to 9999.
for 10.00 to 12.00mL/min xxxx = 1000 to 1200.
PR OK,x/
(x, xx, xxx, or xxxx)
Reads the pump's current pressure, where:
x, xx, xxx, or xxxx = Current pressure in PSI
CC OK,x,y.yy/
(x, xx, xxx, or xxxx)
(y.yyy, y.yy, yy.yy, or yy.y)
Reads the pump's current pressure and flowrate, where:
x, xx, xxx, or xxxx = Current pressure in PSI
y.yyy, y.yy, yy.yy, or yy.y = Flow rate in mL/min
The format is y.yy and yy.yy for a standard pump head,
y.yyy for micro pump head or yy.y for a macro pump
head.