Keyswitch Input And Coil Return; Keyswitch And Coil Return Input Specifications; Communications Ports; Communications Port Specifications - Curtis 1222 Manual

Curtis 1222 Manual,
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2 9 J A N U A R Y 2 0 1 3 D R A F T

Keyswitch input and coil return

Keyswitch power to the 1222 is provided through the coil return of the traction
controller. This ensures that the steer controller is not turned Off unless the
traction controller is Off. Both controllers shut down in the event of a fault.
Coil suppression for the traction controller is provided when the traction
main contactor and EM brake are wired to the fault output (pin 24). However,
you may wish to use coil suppression diodes to reduce EMI emissions.
Coil Return should be wired to the positive battery side of the steer
contactor so that switching noise associated with PWM operation of the
contactor is localized to the contactor wiring only.
Reverse polarity protection is ensured only when the keyswitch input and
coil return are wired as shown in Figure 3a (page

KEYSWITCH AND COIL RETURN INPUT SPECIFICATIONS

SIGNAL NAME PIN
Keyswitch 1 Between under-
and overvoltage
cutbacks
Coil Return 13

Communications ports

Separate CAN and serial ports provide complete communications and program-
ming capability for all user available controller information.
Note: The 1222 controller has no internal 120Ω CAN terminating resis-
tor. Typically the wiring of the CAN bus nodes is a daisy chain topology with
120Ω CAN terminating resistors at each end. If the vehicle wiring is done such
that the 1222 is the last node in the chain, then an external 120Ω terminating
resistor should be provided by the OEM in the wiring harness.
The Curtis programmer plugs into a connector wired to pins 28 and 29,
along with ground (pin 7) and the +10V power supply (pin 15); see wiring
diagram, Figure 3a.

COMMUNICATIONS PORT SPECIFICATIONS

SIGNAL NAME PIN PROTOCOL
CAN High 23 CANopen
CAN Low 35
Tx 28
1313 Handheld
Rx 29
1314 PC Program-
2 — INSTALLATION & WIRING:
OPERATING
MAX INPUT
VOLTAGE
CURRENT
50–500 mA
+ coil return current
10 A
SUPPORTED
/
DEVICES
DATA RATE
up to 1 Mbps
as required,
9.6 to 56 kbps
Programmer,
ming Station
I/O Signal Specifications
11)..
PROTECTED ESD
VOLTAGE TOLERANCE
65 V ±8 kV (air
discharge)
65 V
PROTECTED ESD
VOLTAGE TOLERANCE
-5 V to ±8 kV (air
(MaxV + 10 V) discharge)
with <30 V
differentially
-0.3 to 12 V ±8 kV (air
discharge)
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