INSTRUMENT MANUAL
VACUUM GAUGE MODEL MM200
160Phone:(215) 947-2500 fax:(215) 947-7464 e-mail:sales@televac.com web site:www.televac.com
MM-200_im REV M
Page 104 of 160
605 COMMUNICATIONS - FOR SOFTWARE VERSIONS 1.21 – 1.34
RS232
PROTOCOL The Televac Modular Vacuum Gage accepts various
sensors and relay modules. Upon power-up, the processor determines the actual configuration of the Modular unit
by way of electrical tests.
Aside from the front panel operation of the modular unit, there are a number of commands that can be issued by
way of the RS232 or RS485 interface (comm. interface) to control the operation of the modular unit.
A summary of these commands is given below, followed by a detailed description. The commands are separated
into groups, where in each group the commands relate to a common subject.
Note that in the following discussion, where quotation marks are used, they are neither a part of command nor of
the response. Also, the symbol "<cr>" refers to the sending of a carriage return, either in the command, or in the
response. All commands will produce a response, so that the host will know that the command has been received.
If a command is not recognized as a legitimate command, the response will be a question mark "?<cr>".
Commands that do not require a response otherwise, will respond with "A<cr>" to indicate that the command has
been received and the required action will be taken.
The communication protocol requires eight bits of data, one start bit and one stop bit. The use of parity is optional,
as can be seen under the communications commands. The parity bit, if used,
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