124 Z4Mplus and Z6Mplus User Guide
DB-9 Connectors
Printer Interface Technical Information
Printer Interface Technical Information
Serial Data Communications
Hardware Control Signal Descriptions
For all RS-232 input and output signals, the Z4Mplus and Z6Mplus printers follow
both the Electronics Industries Association (EIA) RS-232 and the Consultative
Committee for International Telegraph and Telephone (CCITT) V.24 standard signal
level specifications.
When DTR/DSR handshaking is selected, the Data Terminal Ready (DTR) control
signal output from the printer controls when the host computer may send data. DTR
ACTIVE (positive voltage) permits the host to send data. When the printer places
DTR in the INACTIVE (negative voltage) state, the host must not send data.
Request to send (RTS) is a control signal from the printer that is connected to the clear
to send (CTS) input at the host computer. RTS is always active (positive voltage) when
the printer is on.
Cable Specifications
RS-232 Serial Data Port
The connection for this standard interface is made through the female DB-9 connector
on the rear panel. A DB-9 to DB-25 interface module is required for all RS-232
connections through a DB-25 cable (see page 128 for details).
For all RS-232 input and output signals, the printer follows both the Electronics
Industries Association’s (EIA) RS-232 specifications and the Consultative Committee
for International Telegraph and Telephone (CCITT) V.24 standard signal level
specifications.
Note • When XON/XOFF handshaking is selected, data flow is controlled by the
ASCII Control Codes DC1 (XON) and DC3 (XOFF). The DTR Control lead has no
effect.
