Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 113)

Product Specifications
Appendix A
A-5
The communications specifications conform to HART Field
Communications protocol.
Method of communication Frequency Shift Keying (FSK) Bell
202 Modem Standard with respect to
baud rate and digital ”1” and ”0”
frequencies
Baud rate 1200 bps
Digital ”0” frequency 2200 Hz
Digital ”1” frequency 1200 Hz
Data byte structure 1 start bit, 8 data bits, 1 odd parity bit,
1 stop bit
Maximum multidropped devices 15
Maximum process variable per smart device 256
Maximum communication masters 2
HART Communications
Specifications