Section 5
5-7
5.3.1. RS232C - Pin Designations.
The 6675A Automatic direct-current-comparator is a data communication equipment
(DCE) so TxD is an input (the data which the modem is to transmit).
┌──────┬───────┬─────────────────────────────────┐
│ Pin │ │ Function Direction │
╞══════╪═══════╪═════════════════════════════════╡
│ 1 │ CHG │ CHassis Ground IN/OUT │
├──────┼───────┼─────────────────────────────────┤
│ 2 │ TxD │ Transmit Data IN │
├──────┼───────┼─────────────────────────────────┤
│ 3 │ RxD │ Receive Data OUT │
├──────┼───────┼─────────────────────────────────┤
│ 4 │ RTS │ Request To Send IN │
├──────┼───────┼─────────────────────────────────┤
│ 5 │ CTS │ Clear To Send OUT │
├──────┼───────┼─────────────────────────────────┤
│ 6 │ DSR │ Data Set Ready OUT │
├──────┼───────┼─────────────────────────────────┤
│ 7 │ GND │ Signal Ground IN/OUT │
├──────┼───────┼─────────────────────────────────┤
│ 8 │ DCD │ Data Carrier Detect OUT │
├──────┼───────┼─────────────────────────────────┤
│ 20 │ DTR │ Data Terminal Ready IN │
├──────┴───────┴─────────────────────────────────┤
│ All other pins not used or connected. │
└────────────────────────────────────────────────┘
Table 5-3 : RS232 Connector Pin Designations
5.3.2. RS232C Responses.
The reply to any RS232C query command will be a sequence of ASCII characters followed
by a Carriage-Return character (0x0D) and then a Line-Feed character (0x0A). The
Line-Feed character may also be expressed as 0A
16
or 10
10
or 12
8
or control-J. Throughout
this document we will use the "C" programming language notation for expressing numbers
in base 16, specifically 0x0A indicates that 0A is to be interpreted in base 16 (hex).
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