Programming Guide – 25
Table 8: RS232 Interface Specifications
Name Symbol Pin Number Signal Direction
transmitted data TxD 2 out
received data RxD 3 in
request to send RTS 8 out
clear to send CTS 7 in
data terminal ready DTR 6 out
signal ground SG 5 —
The data protocol is permanently set to 1200 baud ASCII character code, with eight bits per
character, one stop bit, and no parity bit. The serial port of the controlling computer must be
configured with the same settings.
RS232 Driver
Pin Assignment
The RS232 driver pin assignment is shown in Figure 16.
Figure 16: Driver Pin Assignment
Caution
Do not exceed 100 mA per driver.
Operation and Query Commands
Operation and query commands control instrument functions and are interface-independent.
Command Parser Rules
• A command consists of a mnemonic (for example, CLOSE) and, if required, a data
parameter. The mnemonic and the data parameter must be separated by at least one
space.
• Parameters can be entered in various formats; for example, 10, 10.0, and 1.0e1 are all
recognized as the same value.
• Commands can be sent in uppercase or lowercase characters.
