rs-232 interface
this printer is configured as data terminal equipment (dte). the serial data cable used to connect the printer to the host computer is one of two styles:
1 9-pin to 25-pin cable — (null modem cable) must have a 9-pin "d" type (db-9s) connector on the end that is plugged into the serial port at the computer and a 25-pin "d" type (db-25p) connector on the other end that is plugged into the connector at the rear of the printer. figure 36 shows the required cable connections.
2 25-pin to 25-pin cable — (null modem cable) must have a 25-pin "d"?type (db-25s) connector on the end that is plugged into the serial port at the computer and a 25-pin "d"?type (db-25p) connector on the other end that is plugged into the connector at the rear of the printer. figure 37 shows the required cable connections. figure 36
hardware control signal descriptions
for all rs-232 input and output signals, the z4m and z6m 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.
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.
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.
this printer complies with fcc “rules and regulations”, part 15 for class b equipment, using fully shielded six-foot data cables. use of longer cables or unshielded cables may increase radiated emissions above the class b limits.
rs-485 interface
figure 38 illustrates the pin connections on the db-25 connector at the rear of the printer that are used for the rs-485 communication protocol.
xon/xoff handshaking must be used for rs-485 communications.
