Rice Lake Zebra GK420t - Manual (Page 94)

Serial Port Interface
82
980610-001 Rev. A GK420t User Guide 12/14/07
Serial Port Interface
The maximum current available through the serial and/or parallel port is not to
exceed a total of 0.75 Amps.
When XON/X OFF handshaking is selected, data flow is controlled by the ASCII
control codes DC1 (X ON) and DC3 (XOFF). The DTR control lead will have no
effect.
Interconnecting to DTE Devices — The printer is configured as data terminal
equipment (DTE). To connect the printer to other DTE devices (such as the serial
port of a personal computer), use an RS-232 null modem (crossover) cable. Figure
31 shows the required cable connections.
Interconnecting to DCE Devices — When the printer is connected via its RS-232
interface to data communication equipment (DCE) such as a modem, a STAN-
DARD RS-232 (straight-through) interface cable must be used. Figure 32 shows
the connections required for this cable.
Connecting to the KDU (Keyboard Display Unit) — The KDU was designed for
DCE printer connections and requires a Zebra custom serial port gender changing
adapter. The KDU now includes the KDU adapter and the Zebra kit part number
for the KDU Adapter is 105934-088.
Pin Description
1 Not used
2 RXD (receive data) input to the printer
3 TXD (transmit data) output from the printer
4 DTR (data terminal ready) output from the printer -- controls
when the host may send data
5 Chassis ground
6 DSR (data set ready) input to the printer
7 RTS (request to send) output from the printer -- alway s in the
ACTIVE condition when the printer is turned on
8 CTS (clear to send) - Not used by the printer
9 +5 V @ 0.75 A fused