Serial Configuration
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.
TXD+ TXD- RXD+ RXD-
GND
GND RTS CTS DCD DTR DSR
25
18
10
11
1
7
4
5
17
15
25
19
1
RXD+
RXD-
TXD+
TXD-
GND (optional) Signal GND
Figure 14. RS-422 Pin Assignments
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