A communication system comprising: a transmission line; and at least one slave device comprising: an active pull-down element coupled to the transmission line to pull a voltage on the transmission line low during transmission; and an active pull-up element coupled to the transmission line to pull the voltage on the transmission line high during or after transmission, wherein the active pull-down element is configured to sink more current than may be sourced by multiple active pull-up elements, and the communication system further comprises a first communication circuit configured to: transmit data onto the transmission line according to a SENT protocol by activating the pull-down element and the pull-up element; activate the pull-up element to produce a rising edge within the transmission; and activate the pull-up element during a time period following the rising edge within the transmission to improve immunity to interference on the transmission line, after the rising edge within the transmission is produced. a transmission line; and at least one slave device comprising: an active pull-down element coupled to the transmission line to pull a voltage on the transmission line low during transmission; and an active pull-up element coupled to the transmission line to pull the voltage on the transmission line high during or after transmission, wherein the active pull-down element is configured to sink more current than may be sourced by multiple active pull-up elements, and the communication system further comprises a first communication circuit configured to: transmit data onto the transmission line according to a SENT protocol by activating the pull-down element and the pull-up element; activate the pull-up element to produce a rising edge within the transmission; and activate the pull-up element during a time period following the rising edge within the transmission to improve immunity to interference on the transmission line, after the rising edge within the transmission is produced. an active pull-down element coupled to the transmission line to pull a voltage on the transmission line low during transmission; and an active pull-up element coupled to the transmission line to pull the voltage on the transmission line high during or after transmission, wherein the active pull-down element is configured to sink more current than may be sourced by multiple active pull-up elements, and the communication system further comprises a first communication circuit configured to: transmit data onto the transmission line according to a SENT protocol by activating the pull-down element and the pull-up element; activate the pull-up element to produce a rising edge within the transmission; and activate the pull-up element during a time period following the rising edge within the transmission to improve immunity to interference on the transmission line, after the rising edge within the transmission is produced. transmit data onto the transmission line according to a SENT protocol by activating the pull-down element and the pull-up element; activate the pull-up element to produce a rising edge within the transmission; and activate the pull-up element during a time period following the rising edge within the transmission to improve immunity to interference on the transmission line, after the rising edge within the transmission is produced.