MKS Stabil-Ion 370 Series, Инструкция по эксплуатации, Страница: 91 / 122

4 Preparing the Stabil-Ion System for Operation
4-33
Series 370 Stabil-Ion Instruction Manual - 370119
Consult the user's manual for the host computer to be sure the character framing settings used are in
accord with that established via the switch configuration you have chosen for the RS-485 module.
Communication is via ASCII strings. A message to consists of a start character “#”, an address “AA”,
command, and a command modifier, followed by a terminator. The message may contain leading
spaces, and the command and modifier may optionally be separated by spaces. No spaces may
appear within the command or the modifier, only between them.
The address expected is programmed via the switch settings on the rear of the module. The syntax is
“#AA” where AA is an ASCII representation of the hex address of the controller. The terminator
expected is an ASCII carriage-return denoted here by CR. Note that the terminator is sometimes
appended automatically, by the host computer's interface software, to the message string supplied
by the user. If extra characters are found in the message after it has been successfully interpreted but
before the terminator, they will be ignored.
All messages will receive a reply, consisting of an ASCII string terminated with CR. Pressure
numbers will be returned in the format X.XXE±XX.
Messages may use upper or lower case alpha characters. The controller will always respond with
upper case characters.
4.14 RS-232 and RS-485 Command Syntax
IG1
Definition: Turn IG1 ON or OFF.
Modifiers: ON or OFF
Response: OK if command accepted, INVALID if rejected.
Example: From computer: IG1 ONCRLF
From 370: OKCRLF
NOTES
1. The IG1 ON command will be rejected as INVALID if IG1 is already ON, and IG1 OFF will be
rejected if IG1 is already OFF.
Figure 4-20 RS-485 Data Timing