Epson TM U200D Technical Reference - Page 151
Rev. B, Appendix, TM-U200D/U200PD Technical Manual
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TM-U200D/U200PD Technical Manual RS-485 interface connector pin assignments and functions Pin number Signal name I/O 1 FG - 2 SD1 O 3 RD2 O 4 RD1 I 5 RD2 I 7 SG - 8 RD1 O Function Frame ground Transmit data Transmit data Receive data Receive data Signal ground 1) When DTR/DSR is selected, this signal indicates whether the host computer is BUSY or READY. DR1 > DR2 indicates that the printer is READY and DR1 < DR2 indicates that the printer is BUSY. The BUSY condition can be changed depending on the off-line conditions set by the DIP switches. When the DTR/DSR control is selected, the printer becomes the BUSY state (DR1 < DR2) under the following conditions: Conditions DIP SW Settings ON OFF 1. During the period from when the power is turned on (including resetting using the interface) to when the printer is ready to receive data. 2. During the self-test BUSY BUSY BUSY BUSY Off-line 3. When the cover is open. - BUSY 4. During paper feeding using the paper feed button. - BUSY 5. When the printer stops printing due to a paper-end. - BUSY 6. When an error has occurred. 7. When the receive buffer becomes full. BUSY BUSY BUSY 2) When XON/XOFF control is selected: This signal indicates whether the printer is correctly connected and is ready to receive data. DR1 > DR2 (READY ) indicates that the printer is ready to receive data. The signal is always DR1 > DR2 except in the following cases: t During the period after the power is turned on until the printer is ready to receive data. t During the self test. This signal indicates whether the host computer is BUSY or READY. CS1 > CS2 indicates that the printer is READY and CS1 < CS2 indicates that the printer is BUSY. 10 11 CS 1 CS 2 1) When DTR > DSR is selected: I The signal is checked and data is transmitted only when the host is ready to receive data (READY) (except for transmitted by GS ENQ, DLE EOT or GS a). 2) When XON/XOFF control is selected: Transmits data regardless of the status of this signal. Rev. B Appendix A-3