Printronix T4204 manual Terminating Resistor Configurations, RP1 RP2

Terminating Resistor Configurations

nReverse Request. Driven by the host. Resets the interface and forces a return to Compatibility Mode idle phase.

nData Available / nPeripheral Request. Driven by the printer. Indicates the printer has encountered an error. (Data bits 1 and 5 in Nibble Mode.)

1284 Active / nAStrobe. Driven by the host. A peripheral device is selected.

Host Logic High—Driven by the host. When set to high, the host indicates all of its signals are in a valid state. When set to low, the host indicates its power is off or its signals are in an invalid state.

nInit —Resets init interface from the host.

Terminating Resistor Configurations

The factory equips the printer with terminating resistors that are used for parallel interface configurations suitable for most applications. These 470 ohm pull-up and 1K ohm pull-down terminating resistors are located at RP2 and RP1 on the Controller PCBA.

If the values of these terminating resistors are not compatible with the particular interface driver requirements of your host computer, you may need to install resistors with different pull-up and pull-down values.

RP1

RP2

Figure 6. Resistor Locations

The shipping kit for this printer includes 220 ohm pull-up and 330 ohm pull- down alternate terminating resistors. If you install the 220 ohm pull-up resistor, you must also install the 330 ohm pull-down resistor.

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