Operating instructions

23Interface Specification
23.1RS232C Interface
Each balance is equipped with an RS232C Interface as standard for the attachment of a peripheral device (e.g.
printer or computer).
Schematic Item Specification
Interface type Voltage interface according to EIA
RS-232C/DIN66020 CCITT V24/V.28)
Max. cable length 15 m
Signal level Outputs:
+5 V … +15 V (RL = 3–7 kΩ)
–5 V … –15 V (RL = 3–7 kΩ)
Inputs:
+3 V … +25 V
–3 V … -25 V
Connector Sub-D, 9-pole, female
Operating mode Full duplex
Transmission mode Bit-serial, asynchronous
Transmission code ASCII
Baud rates 600, 1200, 2400, 4800, 9600, 19200,
38400 (software selectable)
Bits/parity 7-bit/none, 7-bit/even, 7-bit/odd, 8-bit/none
(software selectable)
Stop bits 1 stop bit
Handshake None, XON/XOFF, RTS/CTS (software selectable)
End-of-line <CR><LF>, <CR>, <LF> (software selectable)
15
9 6
IN
GND
OUT
HAND
SHAKE
IN
DATA
OUT
RxD
TxD
CTS
RTS
OUT
POWER
SUPPLY
+12V
2nd display mode only
Power supply for
2nd display
+ 12 V, max 40 mA (software selectable, 2nd
display mode only)
23.2USB Device Interface
Each balance is equipped with an "USB Device" Interface as standard for the attachment of a peripheral device
(e.g. computer).
Note: This interface is not suitable to communicate with a Printer.
Schematic Item Specification
Standard In conformity with USB Specification Revision
1.1
Speed Full speed 12 Mbps (requires shielded cable)
Function CDC (Communication Device Class) serial port
emulation
Power usage Suspended device: Max 10 mA
1 VBUS (+5 VDC)
2 D– (Data –)
3 D+ (Data +)
4 GND (Ground)
Shield Shield
Connector Type B
23.3MT-SICS Interface Commands and Functions
Many of the balances and scales used have to be capable of integration in a complex computer or data acqui
sition system.
To enable you to integrate balances in your system in a simple manner and utilize their capabilities to the full,
most balance functions are also available as appropriate commands via the data interface.
All new METTLER TOLEDO balances launched on the market support the standardized command set "METTLER
TOLEDO Standard Interface Command Set" (MT-SICS). The commands available depending on the functionality
of the balance.
86 Interface Specification