SSI America 90-2581 REV B manual A.1.3, Command Interpreter, “/” character

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/
FMxxxx	OK/
PR	OK,x/
	(x, xx, xxx, or xxxx)

CCOK,x,y.yy/

(x, xx, xxx, or xxxx) (y.yyy, y.yy, yy.yy, or yy.y)

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

10.00mL/min xxxx = 0001 to 1000, for 0.1 to 40.0 mL/min xxxx = 0001 to 0400.

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. Reads the pump's current pressure, where:

x, xx, xxx, or xxxx = Current pressure in PSI 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.

A-2