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Zebra S-Series User’s Guide 47
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Request To Send (RTS) is a control signal from the S-Series Printer to the
host computer. RTS is always in the ACTIVE condition (positive voltage)
whenever the printer is powered ON.
Data Set Ready (DSR) is a control signal from the host computer to the
printer. When DSR is in the ACTIVE condition (positive voltage), the
printer can transmit status to the host. When RTS is in the INACTIVE
condition (negative voltage), the printer does not transmit any data.
When DTR/DSR handshaking is selected via DIP Switch #7 at the rear of
the printer, 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.
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 does not have an effect.
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The required cable must have a 25-pin “D” Type (DB-25P) male connector
on one end, which is plugged into the mating (DB-25S) female connector
located at the upper rear of the printer. Tighten the locking screws.
The other end of the signal interface cable connects to an appropriate point
at the host computer. This cable is one of two types depending on the
specific interface requirements. Refer to page 48 for information on the
standard and null modem cables.
Data cables must be fully shielded and fitted with metal or metallized
connector shells. Shielded cables and connectors are required to prevent
radiation and reception of electrical noise.
To minimize electrical noise pickup in the cable:
• Keep data cables as short as possible.
• Do not bundle the data cables tightly with power cords.
• Do not tie data cables to power wire conduits.