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19 The Specifications of the Interfaces
Parallel Interface (in compliance
with specifications of Centronics)
Connector
Signal
Terminal
Signal
Name
Number
Name
NC
36
18
HIGH***
HIGH*
35
17
GND
NC
34
16
GND
GND
33
15
NC
HIGH*
32
14
NC
NC
31
13
HIGH**
30
12
GND
29
11
BUSY
28
10
ACK
27
9
D7
26
8
D6
25
7
D5
GND
24
6
D4
23
5
D3
22
4
D2
21
3
D1
20
2
D0
19
1
STROBE
Device Control Instructions
Device control instructions are used to determine the communication sequence between the plotter and computer
through RS-232C interface and/or tell the plotter the current computer state. Among them, some device control
instructions set the output specifications of RD-GLII/III instructions.
Each device control instruction is organized with three letters: ESC (1Bh), "." and one uppercase letter. Device
control instructions are of two types: one with parameters and the other without parameters.
Parameters can be omitted. A semicolon ";" is used as a delimiter to separate parameters if they are input in
succession. A ";" without parameters means that parameters were omitted.
If parameters are omitted, the default value is set. For a device control instruction with parameters, a terminator
needs to be input in order to signify the end of instructions. A colon ":" is used as the terminator which cannot be
omitted.
Pin Connection
36
18
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19
1
3.3 KΩ
* =
+5 V
1.2 KΩ
** =
+5 V
100 Ω
*** =
+5 V
43
Serial Interface (RS-232C)
Connector
Signal
Terminal
Signal
Number
Number
Number
NC
25
13
NC
NC
24
12
NC
NC
23
11
NC
NC
22
10
NC
NC
21
9
NC
DTR
20
8
NC
NC
19
7
SG
NC
18
6
DSR
NC
17
5
CTS
S.RXD
16
4
RTS
NC
15
3
RXD
S.TXD
14
2
TXD
1
FG
Pin Connection
13
25
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14
1
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