Delta Tau PMAC2A-PC/104 Handwheel Encoder Termination Resistors, Device Resistor Pack Pack Size

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PMAC2A PC104 Hardware Reference Manual

The ‘-‘ inputs of each differential pair each have a hard-wired 2.2 kΩ resistor to +5V; each also has another 2.2 kΩ resistor as part of a socketed resistor pack that can be configured as a pull-up resistor to +5V, or a pull-down resistor to GND.

If this socketed resistor is configured as a pull-down resistor (the default configuration), the combination of pull-up and pull-down resistors on this line acts as a voltage divider, holding the line at +2.5V in the absence of an external signal. This configuration is required for single-ended inputs using the ‘+’ lines alone; it is desirable for unconnected inputs to prevent the pick-up of spurious noise; it is permissible for differential line-driver inputs.

If this socketed resistor is configured as a pull-up resistor (by reversing the SIP pack in the socket), the two parallel 2.2 kΩ resistors act as a single 1.1 kΩ pull-up resistor, holding the line at +5V in the absence of an external signal. This configuration is required if complementary open-collector drivers are used; it is permissible for differential line-driver inputs.

If Pin 1 of the resistor pack, marked by a dot on the pack, matches Pin 1 of the socket, labeled by a white square, then the pack is configured as a bank of pull-down resistors. If the pack is reversed in the socket, it is configured as a bank of pull-up resistors. The following table lists the pull-up/pull-down resistor pack for each input device:

Device	Resistor Pack	Pack Size
Encoder 1	RP30	6-pin
Encoder 2	RP31	6-pin
Encoder 3	RP36	6-pin
Encoder 4	RP37	6-pin
Handwheel Encoder	RP55	6-pin

Handwheel Encoder Termination Resistors

The PMAC provides a socket for termination resistors on the handwheel encoder differential input pairs coming into the board. As shipped, there is no resistor pack in the RP56 socket. If these signals are brought long distances into the PMAC board and ringing at signal transitions is a problem, a SIP resistor pack may be mounted on the RP56 socket to reduce or eliminate the ringing. The 6-pin termination resistor pack is the type that has independent resistors (no common connection) with each resistor using 2 adjacent pins.

10	Acc-1P Hardware Setup

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Contents PMAC2A-PC/104 Copyright Information Delta Tau Data Systems, Inc. Technical SupportTable of Contents Software Setup Base Board Connector Pinouts PMAC2A PC104 Hardware Reference Manual Table of Contents Board Configuration IntroductionOption 12 Analog-to-Digital Converters Acc-1P Axis Expansion Piggyback BoardAcc-1P Option 1 I/O Ports Acc-1P Option 2 Analog-to-Digital ConvertersAcc-2P Communications Board Acc-2P Option 1A USB InterfaceAcc-2P Option 1B Ethernet Interface Acc-2P Option 2 Dpram CircuitryPMAC2A PC104 Hardware Reference Manual Introduction Clock Configuration Jumpers Base Board Hardware SetupBoard Reset Jumpers CPU Jumper Configuration Configuration JumpersResistor Packs Configuration Communication JumpersDevice Resistor Pack Pack Size PMAC2A PC104 Hardware Reference Manual Reserved Configuration Jumpers ACC-1P Hardware SetupE0 Reserved for future use Handwheel Encoder Termination Resistors Jthw Connector DATx SELx ACC-2P Hardware SetupJopt Connector E10 MOx MIx Lines Differential or Single-Ended Handwheel Encoder Selection Power Supplies Digital Power SupplyDAC Outputs Power Supply Machine ConnectionsOvertravel Limits and Home Switches Motor Signals ConnectionsDAC Output Signals Amplifier Enable Signal AENAx/DIRnPulse and Direction Stepper Drivers ExampleAmplifier Fault Signal Fault Acc-1P General-Purpose Digital Inputs and Outputs J7 PortAcc-1P Thumbwheel Multiplexer Port J2 Port Acc-2P General-Purpose Digital Inputs and Outputs Jopt PortAcc-2P Thumbwheel Multiplexer Port Jthw Port Optional Analog Inputs Acc-1P or Acc-2P Handwheel Port JHW / PD PortCompare Equal Outputs Acc-2P Ethernet RJ45 Connector J10 Port Acc-2P USB Connector J1 PortSerial Port JRS232 Port PC DB-9Machine Connections Example Using Analog ±10V Amplifier PMAC2A PC104 Hardware Reference Manual PMAC2A PC104 Hardware Reference Manual Machine Connections Software Setup Operational Frequency and Baud Rate SetupCommunications Pmac I-VariablesI54 Baud Rate Filtered DAC Outputs ConfigurationI54 Baud Rate for Using Flag I/O as General-Purpose I/O General-Purpose Digital Inputs and OutputsAcc-1P with Jumper E6 on Position Flag Type Channel NumberAcc-2P with Jumper E5 in Position Open PLC1 ClearThumbwheel Port Digital Inputs and Outputs Acc-1P with Jumper E6 in PositionBaseboard Analog Inputs Analog Inputs SetupAcc-1P Analog Inputs Board Dimensions Base Board Hardware Reference SummaryFeature Location FeatureBoard Layout Connectors and Indicators Page ACC-1P Hardware Reference Summary TB1 JMACH1 J7 General-Purpose Digital Inputs and Outputs Jopt Port J2 Thumbwheel Multiplexer Port Jthw PortJ8 Handwheel / Pulse and Direction Port JHW / PD Port Page ACC-2P Hardware Reference Summary TB1 Jthw Jopt J8 Handwheel/Pulse and Direction Port JHW / PD Port J1 USB Communications PortJ10 Ethernet Communications Port Page E0 Forced Reset Control E1 Servo and Phase Clock Direction ControlE3 Normal/Re-Initializing Power-Up/Reset Base Board E-POINT Jumper DescriptionsE8 Phase Clock Lines Output Enable E9 Servo Clock Lines Output EnableE10 E12 Power-Up State Jumpers Description DefaultE13 Power-Up/Reset Load Source E14 Watchdog Disable JumperE16 ADC Inputs Enable E15A, B, C Flash Memory Bank SelectPoint and Physical Location Description Default Layout E18 E19 PC/104 Bus AddressE1 E2 Machine Output Supply Voltage Configure ACC-1P E-POINT Jumper DescriptionsE0 Reserved for Future Use E3 E4 JHW, PD Function SelectE6 I/O Gate Address Select E5 Servo Gate Address SelectE7 Machine Input Source/Sink Control E1 USB/Ethernet Micro-Controller Firmware Reload Enable ACC-2P E-POINT Jumper DescriptionsE5 I/O Gate Address Select E6 Communications Port SelectPoint and Physical Location Description Default E7- E10 Ports Direction ControlBase Board Connector Pinouts TB1 Jpwr Power SupplyJ4 JRS232 Serial Port Connector Pin# Symbol Function DescriptionJ3 JMACH1 Machine Port Connector J3 JMACH1 50-Pin Header J4 JMACH2 Machine Port Baseboard Connector ACC-1P Connector Pinouts J2 Jthw Multiplexer Port Connector Pin# SymbolJ3 JMACH1 Machine Port Connector Pin Header J3 JMACH1 50-Pin-Header Connector 34-Pin Header FLG78VJ7 Jopto I/O Port Connector J8 JHW Handwheel Encoder Connector Page Pin # Symbol Function ACC-2P Connector PinoutsJ1 USB Universal Serial Bus Port Optional Pin Connector J7 Jopt I/O Port Connector J10 Ethernet Port Optional Pin # Function