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Appendix: Interface Wiring
Serial Port Interface - Auto-detecting DTE and DCE
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Serial Port Interface - Auto-detecting DTE and DCE
The maximum current available through the serial and/or both USB port is not to exceed a total of
0.75 Amps.
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.
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 STANDARD RS-232 (straight-through)
interface cable must be used. Figure 32 shows the connections required for this cable.
Pin DTE DCE Description (DTE)
1 — 5V Not used
2 RXD TXD RXD (receive data) input to the printer
3 TXD RXD TXD (transmit data) output from the printer
4 DTR DSR DTR (data terminal ready) output from the printer -- controls when the
host may send data
5 GND GND Circuit ground
6 DSR DTR DSR (data set ready) input to the printer
7 RTS CTS RTS (request to send) output from the printer -- always in the ACTIVE
condition when the printer is turned on
8 CTS RTS CTS (clear to send) - Not used by the printer
9 5V — +5 V @ 0.75 A - FET Circuit current limited
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