Epson SR-600 - Manual (Page 188)

Appendix 4-2 COM3 Mode Rev.A
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Mode 2
Mode 2 = DRW/DM-D (displayed during the BIOS setup)
You must set to this mode to equip the optional dedicated DRW Board.
COM3 input signal recognized by Host is only connected to DRW board or DM-D dedicated
connecter at this Mode. Therefore, its operation is not guaranteed with COM3 D-sub connector
connected.
DRW board and DM-D dedicated connecter are in Hydra connection as listed below.
- DRW Hardware Flow control is DSR/DTR
- DM-D Hardware Flow control is RTS/CTS
COM3 Mode Seting Specification
*1:The customer display can be connected if any optional peropheral is connected to COM3 port. Only DM-D that
controls software flow can be used in this case.
*2:SOme of the TM printer (TM-88II) can be used.
Table A4-1 COM3 Mode Setting and Status of each ports
COM3 DM-D dedicated port Drawer Board
Mode0 Normal O/ DTR/DSR, RTS/CTS ▲ *1 / X-on/X-off only ✕/CRT is available
Mode1 TM/DM-D ▲ *2 / DTR/DSR O/ RTS/CTS ✕/CRT is available
Mode2 DRW/DM-D ✕ O/ RTS/CTS O/ DTR/DSR