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Model 100A250A

2.2.2 Remote Operation (continued)

2.2.2.6

IEEE-488 Communications (continued)

IEEE-488 Serial Poll

Response (STB)

(binary/decimal)

(01000001) 65

(01000010) 66

(01000100) 68

(01001000) 72

(01010000) 80

2.2.2.7

RS-232 Communications

If the RS-232 interface is active, the Model 100A250A will test for a properly connected RS-232

interface when it is switched into the remote operation mode. In order for the Model 100A250A to

recognize an RS-232 connection, the "Data Carrier Detect" (DCD) line must be asserted. This line

is sampled continuously to determine if the RS-232 connection is broken; therefore, it must remain

asserted in order for the RS-232 interface to function. The "Clear To Send" (CTS) line is also used

to gate information from the Model 100A250A. This line must be asserted in order to receive

information from the Model 100A250A. The CTS line can be used as a "handshake" line to

inform the Model 100A250A when it is permissible to send information. If the CTS line is de-

asserted in the middle of a transmission, the character in the process of being transmitted will be

completed and further transmission will halt until the CTS line is re-asserted.

Model 100A250A itself asserts two lines: "Data Terminal Ready" (DTR) and "Request To Send"

(RTS). The DTR line is continuously asserted, while the RTS line is used to gate information into

the Model 100A250A. Connector pin-out information is given in Table 2-3.

Table 2-2

Remote Error Codes/Messages

Model 100A250A FAULT

BPM FAULT

THERMAL FAULT

INTERLOCK FAULT

PS1 FAULT

PS2 FAULT

Manual Text

RS-232

Error

Message

The

2-5

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