Seiko Group BP-6000 - Manual (Page 56)

CTS signal (serial interface)
This function accepts or ignores the CTS (Clear to Send) signal from the host.
DSR signal (serial interface)
This function accepts or ignores the DSR (Data Set Ready) signal from the host.
CD signal (serial interface)
This function accepts or ignores the CD (Carrier Detect) signal from the host.
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5. Extended setup options (37-39)
37 CTS ENABLE
CTS: NO
CTS: YES
........... Ignores the CTS signal
........... Functions according to the CTS signal from the host
39 CD ENABLE
CD: NO
CD: YES
........... Ignores the CD signal
........... Functions according to the CD signal from the host
38 DSR ENABLE
DSR: NO
DSR: YES
........... Ignores the DSR signal
........... Functions according to the DSR signal from the host