
Users Manual & Installation Guide
PV- 1800: Power supply module with GSM MODEM
Internal registers  | 
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  | Address | Access | Name | Function | 
  | Base+0  | Read only  | REG_SIGN  | Signature (8Ch)  | 
  | Base+1  | Read only  | REG_MODEL  | Model  | 
  | Base+2  | Read/write  | REG_DIGOUT  | Digital outputs  | 
  | Base+3  | Read only  | REG_DIGIN  | Digital inputs  | 
  | Base+4  | Read only  | REG_CNTLO  | Counter LSB  | 
  | Base+5  | Read only  | REG_CNTHI  | Counter MSB  | 
  | Base+6  | Read/write  | REG_CNTMODE  | Counter configuration  | 
  | Base+7  | Read/write  | REG_MODEM  | Modem status and on/off command  | 
  | Base+8  | Read/write  | REG_UPS  | UPS status  | 
  | Base+9  | Read/write  | REG_UPSSHDN  | Delayed UPS shutdown  | 
  | Base+0Ah  | Read/write  | REG_ADCLO  | ADC command/result LSB  | 
  | Base+0Bh  | Read/write  | REG_ADCHI | ADC result MSB  | 
  | Base+0Ch  | -  | reserved  | 
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  | Base+0Dh  | -  | reserved  | 
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  | Base+0Eh  | -  | reserved  | 
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  | Base+0Fh  | -  | reserved  | 
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REG_SIGN (base+0): Signature (read only)
Always reads 8Ch. Can be used by software to verify the presence of the 
REG_MODEL (base+1): 
When the firmware is changed to remove, add, or change features, the model number is changed. Current model number is 00h.
REG_DIGOUT (base+2): Digital outputs (read/write)
Writing to bit 
Reading bit 
Bit 7 is always 0.
REG_DIGIN (base+3): Digital inputs (read only)
Reading bit 
DI0 and DI1 can also be used as counter inputs. Regardless of this, their current status can always be read at this register.
REG_CNTLO (base+4): Counter low byte (read only)
Reading this register returns bit 
REG_CNTHI (base+5): Counter high byte (read only)
Reading this register returns the previously stored value of bit 
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