Siemens OCM III Instruction Manual page 100

The OCM-3 provides serial communication either through Milltronics proprietary
bipolar current loop or industry standard RS-232. Communication can be used to
provide a video or paper printout of OCM activity. It can also be used to provide
remote programming and retrieval of the data log, from devices such as computers
and PLCs.
When using the bipolar current loop, communication runs of up to 1,500 m can be
achieved, as opposed to the limited runs of 15 m using RS-232. By terminating the
bipolar current loop with a Milltronics CVCC, the communication format is then
converted to RS-232.
RS-232
serial printer
* Milltronics OCM -3 Utilities Software available
** provides conversion to RS -232 or 422
7ML19985AB01
COMMUNICATIONS
customer's
computer *
OCM III
OCM - 3
site number
(P39 )
bipolar current loop
CVCC **
customer's
computer *
optional parallel printer
101