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Serial Configuration
143
Serial Configuration
SYSGEN - Use the ASYNC_PRT macro name.
CHAR8 SYSGEN modifier is highly recommended.
SPOOLCOM - DEVTYPE should be blank.
NOTE: DEVSUBTYPE SYSGEN modifier must be set to 32.
ETX/ACK - Protocol is not recommended.
CURRENT LOOP - Supported only when using a Current Loop to
RS232 adapter, TCL2 (P/N 50069). Flow control is provide by XON/
XOFF only. On the printer set the DTR option to True. Note that any
other setting can cause Framing and Parity errors.
RS232 - Supports both XON/XOFF and DTR. Both XON/XOFF and
DTR are used for flow control only, and do not provide any status back
to the host other than printer ready, or not ready. For a complete list of
attributes for serial printers, refer to the System Generation manual for
Terminals and Printers (P/N 107875).
RS422 - Supported by both Compaq hosts and printers. However, the
RS422 cables provided by Compaq are not suitable for use with these
printers. Thus, a custom cable must be used if you are using the RS422
protocol. (See Figure 14 for pin assignments for a typical RS422
connection.) Flow control is provided by XON/XOFF only.
Figure 14. RS-422 Pin Assignments
TXD+ 25 17 RXD+
TXD- 18 15 RXD-
RXD+ 10 25 TXD+
RXD- 11 19 TXD-
GND 1 1 GND
(optional)
GND 7 Signal GND
RTS 4
CTS 5
DCD 8
DTR 20
DSR 6