KD Scientific Gemini 88 - Manual (Page 20)

18
KDS Gemini 88
Pump Chain Commands
PUMP CHAIN COMMANDS AND RESPONSES
The Pump Chain RS-232 interface is used to enhance the control applications of the Pump
33. This interface allows all control information to be entered into the pump from an external
source such as a computer. In addition, this interface allows up to 100 Pump 33’s or, in cer-
tain cases, other RS-232 devices to be controlled from a single RS-232 communication port
on a computer. Assign each pump in the pump chain a unique address from 0 to 99. This
address is used to identify which pump is to receive a command and which pump is respond-
ing. Configure each pump with its assigned address and the baud rate being used (See
External Control & Interfaces). When a pump is sent a command, or a request is made for its
prompt, the Remote LED on the display will illuminate, indicating that the pump is receiving
pump chain commands. The LED remains illuminated until the pump is turned off or SET and
1 is entered on the keypad, indicating a change in the pump chain configuration.
A pump will not respond to pump chain communication while it is in a setting mode (entered
when the user presses the SET key). The pump can still be controlled from the keypad while
it is in a pump chain. Control data that is changed via RS-232 will NOT be stored in the
pump’s non-volatile memory unless requested with the “SAV” command or other data is
changed from the keypad. Each command sent to the pump chain is a string of ASCII char-
acters, with leading zero’s on numbers and all spaces optional. Numbers are a maximum of
five digits. The following symbols are used in describing the commands:
Symbol Meaning
[. . . ] optional
{. . . } select one
| either–or
f digits 0-9 or a decimal point
d digits 0-9
<cr> carriage return (ASCII 13)
<lf> line feed (ASCII 10)
<float> f f f f f f
<integer> d d d d d
<text> any string of ASCII characters
Command Formats Meaning
<cr> Stops all pumps. All pumps on the pump chain interpret
this as a stop command, but do not respond with a prompt.
pump address, <cr> Request for prompt. The pump with the indicated
address responds with its prompt.
optional pump address, Sends a command to a pump. The pump
command, <cr> with the indicated address executes the command then
responds with its prompt. The optional pump address, if
not specified, will default to pump address 0.
After each command is received and executed, the pump acknowledges the command with
a prompt. Preceding the prompt will be the text response, if applicable. The text response
will be one or more lines of ASCII text, each preceded by a line feed and terminated by a
carriage return:
<lf>, <text>, <cr>