Specifications
32056L Rev. 2 12/4/01 105SL Maintenance Manual Page 2-7
OPERATION OVERVIEW SECTION 2
• Keep data cables as short as possible.
• Do not bundle the data cables tightly with the power cords.
• Do not tie the data cables to power wire conduits.
NOTE: Zebra printers comply with FCC “Rules and Regulations”, part 15, Subpart
J, for Class A equipment, using fully shielded 6 foot long data cables. Use
of longer cables or unshielded cables may increase radiated emissions
above the Class A limits. RS-422 and RS-485 applications should use
twisted shielded pairs as recommended in the Appendix of the TIA/ETA-485
Specification.
&RPPXQLFDWLRQ%XIIHU
The 105SL printer has a communication buffer that stores the incoming data until that
information can be acted upon (imaged). Communication handshaking (DTR/DSR control
signals or XON/XOFF control codes) is used to control when the host can send data to the
printer.
As data is received by the 105SL printer, the processor monitors the number of characters in
the buffer. If the buffer is filled beyond its limit, the printer turns DTR to the OFF condition
(negative voltage) or transmits an XOFF (DC-3) control character to the host. When the buffer
empties below this limit, the 105SL turns DTR to the ON condition (positive voltage) or
transmits an XON (DC-1) control character to the host.
6WDQGDUG6HULDO&RPPXQLFDWLRQ&RQQHFWRU
The DTE port is a DB-25S or a DB-9S connector located at the rear of the printer. It provides
connection to a host via RS-232, RS-422 or RS-485 signaling. Refer to Figure 2-6 for the
DB-25 serial interface or to Figure 2-7 for the DB-9 serial interface wiring diagram.
Figure 2-6. Serial Interface (Printers with DB-25 Connector)
+5 VDC source
Data output B(-)
Data output A(+)
Data input B(-)
Data input A(+)
Signal ground reference
Frame ground
9
14
19
13
16
11
1
1 Amp
10k
10k
100
20k
F1
+5 V
+5 V
RS-422/RS-485 connector
rear panel DB-25S
FG (frame ground)
TXD (transmit data) output
RXD (receive data) input
RTS (request to send) output
DSR (data set ready) input
SG (signal ground)
+5 VDC source
DTR (data terminal ready) output
1
2
3
4
6
7
9
20
1 Amp
F1
+5 V
RS-232 connector (DTE)
rear panel DB-25S