Instrumentation Systems & Services MicroSpeed 196, Руководство пользователя

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XII.
SERIAL COMMUNICATIONS
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VIA RS422
USlNG THE REMOTE SERIAL lNTERFACE:
To control through the RS422 Serial Interface, the Local/Remote Input (TB1-10)
must be closed to common (TB1-11). This allows the MicroSpeed 196 to accept
commands over the RS422 link. The MicroSpeed 196 can be set up to only accept
commands over the RS422 link, or to allow some operator control as programmed with
Variable 30. All new set points and programming must come over the RS422 link,
except for speed changes with the scroll, or set point 1 - 4 switches. The
E-Stop input
is also active in any mode of operation, and cannot be disabled.
Note: It is recommended that an optically isolated RS422 link be used between your
computer and the MicroSpeed 196. Electrical noise will corrupt data on the computer,
causing it to send bad data, interpret data incorrectly, or lock up computer functions.
Prolonged exposure of your computer to electrical noise will destroy your computer!
Important: Remote setup Variables must be Setup from the keypad.
VARIABLE 19 - NODE ADDRESS
-
Enter an address from 1 - 99. This address will
be used in the command format to talk to the MicroSpeed 196 with that specific
address. When using a global command (address 00) the MicroSpeed 196 with node
address 01 will be the only MicroSpeed 196 to answer the host computer, but all
MicroSpeed 196’s will respond to global commands. Never duplicate an address on the
same communications port.
VARIABLE 20 - BAUD RATE -
Enter the number (l-6) corresponding to the desired
operating baud rate. Each character has one start bit, eight data bits, one stop bit, and
no parity.
1 = 300
2 = 1200
3 = 2 4 0 0
4 = 4800
5 = 9600
6 = 1 9 2 0 0
VARIABLE 30 - EXTERNAL SWITCH ENABLE IN REMOTE MODE - This
variable allows the external inputs to be active during Remote mode. Entering a 1
enables the function. Entering a 0 disables the function. Default is 0000, or all functions
controlled by the RS422 link. Any combination of functions can be selected:
0001 = Run, Stop, and Jog inputs enabled
0010 = Forward/Reverse, Master/Follower, Closed/Open Loop,
Scroll up and Scroll Down inputs enabled
0100 = Set Points 1,2,3&4 Enabled
1000 = Keypad RUN, STOP, and JOG enabled
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Variable 48 - Buffer Error - This variable is used to help diagnose communication
errors. If the variable displays a 1, then characters outside the Microspeed 196 protocol
format have been received by the MicroSpeed 196. If the variable displays a 2, then
transmissions have been sent to the MicroSpeed 196 faster than it can process the
information and respond. The most recent error is kept in this variable until you set it to 0.
Diagram 8
RS422 Hook-Up
MicroSpeed 196’s Host Device
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