ElmoMC SimplIQ Software Manual - Manual (Page 18)

SimplIQ Software Manual Communication with the Host
MAN-SIMSW (Ver. 1.4)
3-3
3.4 Errors and Exceptions in RS-232
If an error is intercepted (over-run, noise, parity or framing), the entire message,
including the error, is discarded and a “communication error” code response is
transmitted.
The communication is defined as 8 bits per character. The SimplIQ drive will normally
only transmit characters in the range [0…127] with the exception of error codes (refer to
section 3.1 ). The SimplIQ drive accepts RS-232 bytes only in the range [0…127]; received
byte values in the range [128…255] are treated as UART errors.
Empty strings with terminators are echoed back, but are otherwise ignored.