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Chapter 2 New for OEM7 – Firmware
2.2.7 COMCONTROL
Controls the serial port hardware control lines
Platform: OEM729, OEM719, OEM7700
This command is used to control the hardware control lines of the serial communication (COM)
ports. The TOGGLEPPS mode of this command is typically used to supply a timing signal to a
host PC computer by using the RTS and DTR lines. The accuracy of controlling the COM control
signals is better than 900 ms. The other modes are typically used to control custom peripheral
devices.
1. If handshaking is disabled, any of these modes can be used without affecting regular
serial communications through the selected COM port. However, if handshaking is
enabled, it may conflict with handshaking of the selected COM port, causing unex-
pected results.
2. The PULSEPPSLOW control type cannot be issued for a TX signal.
3. Only PULSEPPSHIGH, FORCEHIGH and FORCELOW control types can be used for a TX
signal.
Message ID: 431
Abbreviated ASCII Syntax:
COMCONTROL [port] [signal] [control]
Factory Default:
COMCONTROL COM1 RTS DEFAULT
COMCONTROL COM2 RTS DEFAULT
COMCONTROL COM3 RTS DEFAULT
COMCONTROL COM4 RTS DEFAULT
COMCONTROL COM5 RTS DEFAULT
ASCII Example 1:
SERIALCONFIG COM1 9600 N 8 1 N (to disable handshaking)
COMCONTROL COM1 RTS FORCELOW
ASCII Example 2:
COMCONTROL COM1 RTS TOGGLEPPS
COMCONTROL COM2 RTS TOGGLEPPS
COMCONTROL COM3 RTS TOGGLEPPS
ASCII Example 3:
To set a break condition on COM1:
COMCONTROL COM1 TX FORCELOW
A break condition remains in effect until it is cleared. To clear a break condition on AUX:
COMCONTROL COM1 TX DEFAULT
OEM6 to OEM7 Integration Guide v1
21
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