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| | | | | | | | | | | | | | | | | | | | | | | | | | SPECIFICATIONS | | | | | | | | | | Input Power: +5VDC ±0.25VDC @ 300 mA max to power both the Model VA and the 9710. Output: The customer interface is a 20-pin IDC with 3 bytes multiplexed onto 8 data lines: | | | | | | | | | | | | | | | | | | | | | | | | PIN | NAME | TYPE | DESCRIPTION | □ | PIN | NAME | TYPE | DESCRIPTION | | | | 01 | Status | Output | 0 = Data output valid, 1 = Data not valid | 1 | 11 | D5 | Output | Data bit | | | | 02 | Cos | Output | Quadrature square wave at the frequency of disc/scale | 1 | 12 | D4 | Output | Data bit | | | | 03 | Sin | Output | Quadrature square wave at the frequency of disc/scale | 13 | D3 | Output | Data bit | | | | 04 | Index | Output | Quarter cycle gated, active only after initialization | 1 | 14 | D2 | Output | Data bit | | | | 05 | Clear | Input | 0 = Clear error flags without resetting decoder | 1 | 15 | D1 | Output | Data bit | | | | 06 | Hold | Input | 1 = Freeze 24 bit buffer, 0 = Follow data | 16 | D0 | Output | Data bit, LSB | | | | 07 | A1 | Input | MSB, byte select address | | 17 | Reset | Input | 0 = Reset decoder by external control | | | | 08 | A0 | Input | LSB, byte select address | | 18 | VCC | Power | Single +5VDC supply | | | | 09 | D7 | Output | Data bit, MSB | 19 | Ground | Power | Supply return | | | | 10 | D6 | Output | Data bit | 20 | Case | Power | Cable shield braid & electronics pkg housing | | | | | | | | | | | | | | | | | | | | | | | | The 20-bit absolute position data is provided in three bytes. Each byte has its own address, which is determined by the states of address lines A1 and A0. The Status bit and three Error Flags are also included as part of the complete 24-bit word. | | | | | | | | | | | | | | | | | | | | ADDRESS | DATA | | | | A1 | A0 | BYTE | BIT | FUNCTION | | | | | | | D7 | Status bit: 0 = data valid, 1 = data not valid | | | | D6 | B19, MSB of 20 bit absolute position output word * | | | | D5 | B18 | | | | 1 | 1 Hi | D4 | B17 | | | | D3 | B16 | | | | D2 | B15 | | | | D1 | B14 | | | | D0 | B13 | | | | 1 | 0 Mid | D7 | B12 | | | | D6 | B11 | | | | D5 | B10 | | | | D4 | B09 | | | | D3 | B08 | | | | D2 | B07 | | | | D1 | B06 | | | | D0 | B05 | | | | 0 | 1 Lo | D7 | B04 | | | | D6 | B03 | | | | D5 | B02 | | | | D4 | B01 | | | | D3 | B00, LSB of 20 bit absolute position output word | | | | D2 | Flag: 1 = disallowed quadrature state transition detected | | | | D1 | Flag: 1 = analog signal fault detected by watchdog | | | | D0 | Flag: 1 = bit sequence error, synchronization lost | | | | 0 | 0 Hi-Z | D7-D0 | All data lines are Tri-stated | | | | | | | | | | | | | | | | | | | | * When resolution is less than 20 bits, MSB is always on Hi D6. Any unused Lo D3, D4, D5...etc., are set to zero (logic low). Flag bits stay on D0 - D2 of the Lo byte. | | | | | | | | | | Gurley Precision Instruments 514 Fulton Street Troy, NY 12180 U.S.A. (800) 759-1844, (518) 272-6300, fax (518) 274-0336, Online at www.gurley.com, e-mail: info@encoders.com | | | | | | Page 3 of s V3.1 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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