RS232 Modem Support Procedures
6-6 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
GPIB/RS232 Modem Commands
The following table lists the GPIB/RS232 Modem Commands and the special serial interface
only commands:
The RS232-type commands (!BYE, !SPL and !DCL) do NOT require terminating. All other
commands or command strings require a new line character to terminate.
Refer to the System Menu explanation in chapter 4 for information on using the front panel
menus to configure modem operation. Refer to Native GPIB Commands in chapter 6, for
information on using GPIB commands to configure modem operation.
Table 6-2. Character Sequences
Connected Device Character Sequence
Computer connected directly "+++at\r\rS\n"
Modem offline from phone network
Sequence will be seen if remote connection
established
modem status data followed by "S\n"
Modem connected through to remote computer "+++S\n"
Table 6-3. Modem and Special Serial Interface Commands
Command Parameter Definition
!BYE RS232-type command only, allows the remote PC to
instruct the power meter to tell its local modem to
hang-up. This ensures that when communication is
completed, the modems at both ends of the line can
be disconnected and the telephone line released.
!DCL RS232 type command only. Clears all buffered
GPIB/RS232 messages waiting to be processed.
Clears all buffered GPIB/RS232 data waiting to be
output. Stops any pending actions.
!SPL RS232 type command only. Allows a GPIB type
serial poll to be requested in response to an SRQ
from the power meter. This will return the instrument
status register and clear the SRQ bit within that
register. The *CLS command should be used to clear
the rest of the register.
MODDEL <value> Modem redial delay time, 1 to 10 minutes (default =
5 min.)
MODINIT Initialize connected modem
MODLIM <TRUE | FALSE> Autodial enable for limits failure
MODPH <string> Phone number - up to 40 characters
MODPWR <TRUE | FALSE> Autodial enable for power on
MODRED <value> Modem redial count, 0 to 10 (default = 5)
MODRNG <TRUE | FALSE> Autodial enable for range failure
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