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AD5700/AD5700-1 Clear To Send (CTS)

Question asked by Rick7 on Mar 17, 2015
Latest reply on Mar 19, 2015 by Rick7



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:



This SAP is passed back by the Physical Layer to confirm its ability to accept data for transmission, or to indicate it will accept no further data.  In a modem implementation this SAP is usually mapped into the clear to send (CTS) signal from a modem."


Since the AD5700/AD5700-1 devices don't have a CTS signal, how can this requirement be implemented?