User's Manual slip printer CBM-820

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6. Interface

This appendix provides detailed specifications for the printer’s standard serial

interface.

6.1 Pins and Signal Names

No.

Signal

Name

Direction Function

1 FG — Frame ground

2 TXD OUT Transmission data

3 RXD IN Receive data

4 RTS OUT Same as DTR signal

5 N.C. Not connected

6 DSR IN • DIP Switch 9 = OFF

In DTR/DSR communication mode when Memory Switch4-5 = 0, indicates whether data

receive from host is enabled or disabled.

Space: Receive enabled

Mark: Receive disabled

This signal is not checked in the X-ON/X-OFF communication mode.

• DIP Switch 9 = ON

This signal used for external reset. Printer is reset whenever signal is in mark state with

pulse width of 1mS or more.

7 SG Signal ground

8 -19 N.C. Not connected