System Description
I/O Components
Thermo Fisher Scientific Model 49i Primary Standard Instruction Manual 7-11
RS-232 Connection 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 7-1 for the DB9 connector pin configuration.
RS-485 Connection The instrument uses a four wire RS-485 configuration with automatic flow
control (SD). Refer to Table 7-2 for the DB9 connector pin configuration.
Table 7-1. RS-232 DB Connector Pin Configurations
DB9 Pin Function
2RX
3TX
7RTS
8CTS
5Ground
Table 7-2. RS-485 DB Connector Pin Configuration
DB9 Pin Function
2 + receive
8 - receive
7 + transmit
3 - transmit
5 ground
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