Meriam M1500 Digital Pressure Transmitter - Manual (Page 12)

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RS RS RS RS- - - -232 232 232 232
RS-232 is used for point-to-point communication. The M1500 is powered through the terminal block and uses a DB-9
(female)
connector or terminal block for digital communication. Terminal labels follow RS-232 standard
TIA/EIA-232. See the Wiring
Diagrams section for details.
RS RS RS RS- - - -485 485 485 485
RS-485 communication is best for
multipoint networks. The M1500 can
be powered and communicated with
using either the terminal block or the DB-9 pin outs for half-duplex communication. See the Wiring Diagrams section
for details.
USB USB USB USB
High power USB ports supply power for
this M1500 version and can be used for
point-to-point interface with a PC port or
for multiple interfaces using externally
powered USB hubs. The M1500 uses
a standard USB type B connector.
USB drivers for the M1500 must be installed on the host PC prior to communication. These drivers are on the product
CD ROM.
M1500 with USB will not work using low power USB ports; examples are keyboard USB and
unpowered USB hubs. Use the M1500 with high power (500 mA) USB ports only and powered
USB hubs only.
USB Connector
RS-232 / RS-485 Connector