What is the difference between the AD5700 & AD5700-1 products?
Q.
Can the AD5700/AD5700-1 support Full Duplex Operation?
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A.
HART is, by nature, half duplex. It uses one channel (one pair of wires) for both directions. If one side is transmitting and…
The AD5700/AD5700-1 data sheet states that specifications apply to both A and B models ( i.e. "all specifications are from -40°C to +125°C and relate to both A and B models, unless otherwise noted"), but I'm unable to ferret-out what distinguishes between…
Hi,
The HART Protocol Token-Passing Data Link Layer Specification (HCF_SPEC-81 Revision 8.2) talks about Service Access Points (SAPs) that must be supported by a field device.
One of the Physical Layer SAPs is described as follows:
"ENABLE.confirm…
What are the key features of the AD5700 & AD5700-1 HART Modem products?
Referring to Figure 6, this plot is used to demonstrate “Carrier detect off” time (t5 in Table 3 of the datasheet). This is the time from carrier (i.e. HART signal) off to the CD signal falling edge. The time is 6 bit times max. The RXD signal behavior…
I'm not finding any input specification (or application examples) for the HART_IN pin that implies its input z and/or bias current requirements. Specifically, I'm wanting to use the part's internal filter option and am undecided how to apply protection…
Are the AD5700/AD5700-1 Rx and Tx pins in hi-z (essentially benign) when the part is powered-off and/or held in reset?
Hello,
About AD5700-1,
According to datasheet page17 Fig 28 circuit, there is a switch for HART_OUT and RTS signal line go to FIELD INSTRUMENT Line.
Do we have any recommended switch device for this?
Hopefully, a recommended device will strong for…
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