VT1533A Sixteen-Bit Digital I/O Signal
Contents
1. POL INV 132 INP POL NORM 133 NORM is RST default To configure VT1533A channels as 8 bit output ports use the command SOURce FUNCtion SHAPe CONDition lt ch_list gt e The ch_list parameter specifies the first and or second channel in the channel range covered by the SCP s position Ch_list can include channels from multiple SCP positions To configure all channels as outputs on the two VT1533As at SCP positions 4 and 5 send SOUR FUNC COND 132 133 140 141 To configure output channel polarity use the command OUTPut POLarity INVerted NORMal lt ch_list gt To configure low channel to output inverted and high channel to output normal polarity for SCP at position 5 send VT1533A Digital 1 0 SCP 5 Setting Output Type OUTP POL INV 140 OUTP POL NORM 141 NORM is RST default Use OUTPut TYPE ACTive PASSive to set output drive type To configure first channels as active pull ups and second channels as passive pull ups on the two VT1533As at SCP positions 4 and 5 send OUTP TYPE ACTIVE 132 140 OUTP TYPE PASSIVE 133 141 Programming with the VT1415A Algorithm Language The following example shows the command sequence platform language independent to transfer the digital states from the 8 channel 0 inputs to the 8 channel 1 outputs It assumes the SCP is installed in SCP position 0 covers channels 0 and 1 alg string O101 B0 1100 B0 put algorithm source in string var O101 B1 1102. 0 B1 0101 B2 1100 B2 O101 B3 1100 B3 each input channel bit sent to an output channel bit 0101 B4 1100 B4 0101 B5 1100 B5 0101 B6 1100 B6 0101 B7 1100 B7 ALG DEF ALG1 alg_ string send SCPI command to define algorithm ALG1 SOUR FUNC COND 101 set 8 bits in channel 1 to output mode INIT start algorithm using default trig sys setup When the algorithm is run digital state on bits in channel 0 will be output on corresponding bits in channel 1 Over Voltage Protection Note As was mentioned in the first paragraph the VT1533A can sense an over voltage condition on any of its digital I O terminals This is to protect the SCP and the module it is installed on from damaging voltage levels If greater than approximately 6 Volts is applied to an I O terminal the SCP will signal the VXI module to open all of its Calibration Protection relays The module will then generate an error message in its error queue read by SYST ERR and set a status bit in its STAT QUES COND register The over voltage protect condition is reset by issuing RST 6 VT1533A Digital 1 0 SCP RST and TST important The electrical model of a VT1533A input is essentially a 1 2 kQ resistor in series with 3 Volts DC This circuit will look like a high logic level to a another TTL compatible digital input When RST or TST is executed VT1533A channels configured as outputs return to their default settings as inputs The RS
3. 6 24 32 40 48 and 56 The value returned for the VT1533A SCP is HEWLETT PACKARD E1533A Digital I O SCP 0 0 4 VT1533A Digital 1 0 SCP Configuring the Two Channels Configuring for Input Configuring Input Polarity Configuring for Output Configuring Output Polarity To determine the type of SCP installed on channels 0 through 7 send SYST CTYPE 100 query SCP type ch 0 enter statement here enter response string The VT1533A has two eight bit ports Each of these groups of eight bits is accessed as a channel The allowable channels are the first two channels in the SCP s current SCP position For instance if the SCP is installed in SCP position 0 the allowable channels would be 0 and 1 If in position 7 the channels would be 56 and 57 The first channel number for each of the eight SCP positions are 0 8 16 24 32 40 48 and 56 To configure VT1533A channels as 8 bit input ports use the command SENSe FUNCtion CONDition lt ch_list gt e The ch_list parameter specifies the first and or second channel in the channel range covered by the SCP s position Ch_list can include channels from multiple SCP positions To configure channels 40 and 41 as inputs SENS FUNC COND 140 141 To configure input channel polarity use the command INPut POLarity INVerted NORMal lt ch_list gt To configure low channel to input inverted and high channel to input normal polarity for SCP at position 4 send INP
4. SCP 6 SCP 7 Channel bit channels channels channels channels channels channels channels channels 0 B0 amp 0 Bl OL amp H 8L amp H I6L amp H 24L amp H 32L amp H 40L amp H 48L amp H 56L amp H 0 B2 amp 0 B3 IL amp H 9L amp H I17L amp H 235L amp H 3L amp H 4L amp H 49L amp H 57L amp H 0 B4 amp 0 B5 2L amp H 10L amp H 18L 8 H 26L H 34L 8H 42L amp H SOL amp H S8L 8H 0 B6 0 B7 3L amp H 11L amp H 19L amp H 27L amp H 35L amp H 43 L amp H SIL amp H S9L 8H 1 B0 amp 1 B1 4L amp H 12L amp H 20L amp H 28L amp H 36L amp H 44L amp H 52L amp H 60L amp H 1 B2 amp 1 B3 SL amp H 13L 8 H 21L amp H 29L amp H 37L 8H 45L amp H 53L 8H 61L amp H 1 B4 amp 1 B5 6L amp H 14L amp H 22L amp H 30L 8H 38L 8 H 46L H 54L 8H 62L 8H 1 B6 1 B7 7L amp H 15L 8H 23L amp H 31L amp H 39L amp H 47L amp H 55L amp H 63L 8H Programming With SCPI Commands Checking the ID of the SCP The SCPI commands shown here query the SCP s identification string and configure the two digital channels The VT1415A doesn t provide SCPI commands to read an input channel or control an output channel See the following section for a digital input output example To verify the SCP type s installed on your VXI module use the SYSTem CTYPE lt channel gt command e The channel parameter specifies a single channel in the channel range covered by the SCP of interest The first channel number for each of the eight SCP positions are 0 8 1
5. T condition for channel POLarity returns to NORM as well You should keep this behavior in mind when applying the VT1415A to your system It is best to have your system digital inputs use a high input as their quiescent or safe state VT1533A Digital 1 0 SCP 7 Specifications These specifications for the VT1533A reflect its performance while installed on your VXI module General Specifications Output Characteristics Characteristic OUTPut TYPE ACTive OUTPut TYPE PASSive current source logic 1 current sink logic 0 Voltage logic 1 Voltage logic 0 5 mA 48 mA 2 5 V Min 5 mA load 0 5 Max 48 mA load 0 48 mA NA 0 5 Max 48 mA load Input Characteristics Characteristic Equivalent circuit 1 2 kQ connected to 3 Volts Maximum input low 0 8 Volts Minimum input high 2 Volts Maximum voltage applied to any input output terminal 5 5 V inputs clamped at 0 8 V must limit current NOTE For detailed information on I O characteristics refer to a data sheet for the 75ALS160 Interface Bus Transceiver 8 VT1533A Digital 1 0 SCP
6. VT1533A Sixteen Bit Digital I O Signal Conditioning Plug on User s Manual Enclosed is the User s Manual for the VT1533A Signal Conditioning Plug on Insert this manual in your VXI Module s User s Manual behind the Signal Conditionining Plug ons divider APPLICABILITY This SCP is used with the VT1415A mr VXI Technology Copyright VXI Technology Inc 2003 Printed July 2 2003 Manual Part Number 82 0091 000 Printed in U S A VT1533A Digital Input Output Signal Conditioning Plug on Introduction The VT1533A Digital I O SCP provides 16 TTL compatible bits They are grouped as two eight bit channels Each channel can be configured as an 8 bit input port or an 8 bit output port Further each channel when configured for output can be either passive resistor pull up or active transistor pull up About this Manual This manual shows you how to configure the Signal Conditioning Plug on SCP using SCPI commands and explains the capabilities of this SCP The contents of this manual are Installation ia eS aoe Bea Ries hd eee eee ed 3 e Identifying the Plug on 2 0 2 eee eee 3 Field Witt u eee ees dr 4 e Programming With SCPI Commands 245 4 e Programming with the Algorithm Language 6 e Over Voltage Protection 0 0 0 ec e ee nen 6 e RST and TST important 2 0 2 0 0 eee 7 O Specifications sa esed een 8 In
7. stallation Installation for this Plug on is common to several others and is covered in Chapter 1 of your VXI Module User s Manual Identifying the Plug on You ll find the VXI Technology part number on the connector side of the SCP to the left of the serial number bar code For the VT1533A the part number is VT1533A VT1533A Digital 1 0 SCP 3 Field Wiring Since this Digital I O SCP is NOT ISOLATED it is extremely important not to introduce ground current loops in the digital ground wires The use of isolators in your system is highly recommended Please note a significant difference in the connection scheme for this SCP relative to other SCPs In order to provide connection to 16 bits the SCP position s 8 HI and 8 LO terminals are used as digital input output connections They are labeled DO D7 for each channel position Even numbered bits connect to L terminals and odd numbered connect to H terminals Four terminals for digital ground are provided labeled G for each of the two channels The digital grounds are all connected together so are not related to specific bits Mapping Bits to The relationship of bit numbers to the channel HI or channel LO terminals Terminals is dependent on the SCP s installed position For the specific relationship between channel bits and connector terminals see the Terminal Module labels supplied with the VT1533A SCP or the following table SCP s SCP 0 SCP 1 SCP 2 SCP3 SCP 4 SCP 5
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