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Request To Send (RTS) is a Control Signal from the M-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 CTS is
in the INACTIVE condition (negative voltage), the printer will
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 will have no effect.
The required cable must have a 25-pin “D” Type (DB25P) male
connector on one end, which is plugged into the mating (DB25S)
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 will be one of
two types depending on the specific interface requirements. Refer
to the following pages 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:
1. Keep data cables as short as possible.
2. Do not bundle the data cables tightly with power cords.
3. Do not tie data cables to power wire conduits.
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