System Description
I/O Components
Thermo Fisher Scientific
Model 42
i
Trace Level Instruction Manual
8-11
The digital inputs are TTL level compatible and are pulled up within the
analyzer. The active state can be user defined in firmware.
Two serial ports allow daisy chaining so that multiple analyzers may be
linked using one PC serial port.
The standard bi-directional serial interface can be configured for either RS-
232 or RS-485. The serial baud rate is user selectable in firmware for
standard speeds from 1200 to 19,200 baud. The user can also set the data
bits, parity, and stop bits. The following protocols are supported:
●
C-Link
●
Modbus Slave
●
Geysitech (Bayern-Hessen)
●
Streaming Data
The Streaming Data protocol transmits user-selected measurement data via
the serial port in real-time for capture by a serial printer, data logger, or PC.
A null modem (crossed) cable is required when connecting the analyzer to
an IBM Compatible PC. However, a straight cable (one to one) may be
required when connecting the analyzer to other remote devices. As a
general rule, when the connector of the host remote device is female, a
straight cable is required and when the connector is male, a null modem
cable is required.
Data Format:
1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 BAUD
8 data bits
1 stop bit
no parity
All responses are terminated with a carriage return (hex 0D)
Refer to
Table 8–1
for the DB9 connector pin configuration.
Serial Ports
RS-232 Connection
