Datasheet

44895L Rev. 3 3/12/04 S400/S600 Maintenance Manual Page 1-11
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Table 1-8. DB-9P Pinouts
Pin Description
1 Not used.
2 RXD (RS-232 Receive Data): This is the serial data input to the printer from the host.
3
TXD (RS-232 Transmit Data): This lead is the serial data output from the printer. It is on
this lead that printer status or XON-XOFF information is relayed to the host.
4
DTR (RS-232 Data Terminal Ready): This lead is a control output from the printer to the
host. When the DTR control line from the printer is active (positive voltage), the host can
send data to the printer. When DTR is inactive (negative voltage), the host cannot send
data to the printer. This condition occurs when the printer is configured for DTR/DSR
hardware handshaking and the communication buffer is within 256 characters of its
capacity.
5
Signal ground for RS-232: Not tied to frame ground. This lead serves as the voltage
reference between the interfaced devices.
6
DSR (RS-232 Data Set Ready): This is a control input to the printer from the host. The
printer monitors this lead to determine whether the host is ready to receive data/status
from the printer.
7
RTS (RS-232 Request to Send): This is a control output from the printer to the host. RTS
is active (positive voltage) when the printer is On (l). An active RTS indicates that the
printer is ready to receive data.
8 Not used.
9 +5V Fused Output, 1 Amp Max.