Program Interface Library AR_SET_CONFIG
CEI-100/CEI-200/CEI-x20 User’s Manual 136
Threshold = 10 * (2.5V – Vdac) CEI-220/520/520A/620
Threshold = 10 * (Vdac – 2.5V) CEI-820
The default DAC settings (threshold values) are defined as follows:
n = 0x72 (threshold = 2.734V) CEI-220
n = 0x70 (threshold = +3.125V) CEI-520/520A/620 (pos)
n = 0x90 (threshold = -3.125V) CEI-520/520A/620 (neg)
n = 0x90 (threshold = 3.125V) CEI-820
The following CEI-220 items use DAC values:
ARU_RX1_4_THRESH_VALUE rx 1-4 threshold (220)
ARU_RX5_8_THRESH_VALUE rx 5-8 threshold (220)
ARU_RX9_10_THRESH_VALUE rx 9-10 threshold (220)
ARU_RX11_12_THRESH_VALUE rx 11-12 threshold (220)
ARU_INPUT_THRESH_VALUE discrete input threshold =
20 * Vdac (default is 1.56
Volts, 220 only)
ARU_TRANSMIT_VOLT_VALUE xmtr output voltage level
= 10 * Vdac (default is
9.96 Volts, 220 only)
The following items reference CEI-520/520A/620/820 DAC values:
ARU_DAC_VALUE_01 –
ARU_DAC_VALUE_16 raw DAC value (refer to
Appendix C for board-
specific DAC definitions)
See appendix C, “Parametric Voltage Programming“, to determine the
DAC register definitions for your board.
If the CEI-520/520A/620 item is ARU_OUTPUT_LEVEL_ADJ_nn
where nn is the transmitter channel (01 - 32), the valid values are:
AR_ON enable variable transmitter voltage levels
AR_OFF disable variable transmitter voltage levels
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