7I76 2
HARDWARE CONFIGURATION
GENERAL
Hardware setup jumper positions assume that the 7I76 card is oriented in an upright
position, that is, with the host interface DB25 connector pointing towards the left.
VIN POWER SOURCE
The isolated field I/O on the 7I76 runs from a switching power supply that can be
powered by field power or a separate supply (VIN) with ground common with field power.
Normally the 7I76's VIN will be powered with field power. An on card jumper, W1 allows
VIN to be connected to field power. If you wish to use a single power supply for the 7I76s
field outputs and field logic power, W1 should be placed in the left hand position. This
connects field power to VIN. If you wish to use a separate supply for VIN, W1 Should be
placed in the right hand position.
CABLE 5V POWER
The 7I76 can get its 5V encoder, step/dir and serial interface power from the host
interface card if desired. W2 determines if the 7I76 gets this 5V power from the host FPGA
card. If W2 is in the left hand position, host cable power is used. If W2 is in the right hand
position, 5V power must be supplied to the 7I76 via TB3. This option must be set to match
the cable power option of the host FPGA card. If the FPGA card supplies 5V, W2 must be
in the left hand position. If the FPGA card does not supply 5V, W2 must be in the right
hand position. Never apply external 5V power to the 7I76's TB3 connector when W2
is in the left hand position or you may damage the 7I76, FPGA card, PC, or
connecting cable.
SETUP/OPERATE MODE
The 7I76 can run in setup mode or operate mode. In setup mode, the serial
interface baud rate is fixed at 115.2K baud. In the operate mode, the baud rate is set to
2.5M baud (default). Setup mode enables a normal PC to communicate with the 7I76 for
setup purposes. W3 controls the setup/operate mode selection.T W3 must be in the
"operate" mode for normal operation.
W3
MODE
BAUD RATE
LEFT
Operate mode
2.5M baud (default, can be changed)
RIGHT
Setup Mode
115.2K baud (fixed)
ENCODER INPUT MODE
The 7I76s high speed encoder input can be programmed for differential or single
ended mode operation. W4, W5 and W6 set the encoder input mode. When W4,W5,and
W6 are in the right hand position, the encoder input is mode is differential. When W4,W5,
and W6 are in the left hand position, the encoder input mode is single ended or "TTL".
Содержание 7I76
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