Document # 720003-0000
December 2015
24
SPILL PROOF / SPILL PROOF CUTS
Service Manual
RS-232 (DB-25) receptacle
Pin
Signal Name
Printer I/O
Host I/O
Printer Function
1 DGND
Ground Ground Signal
Ground/Aux
Ground
2 RS232_TXD
Output
Input Data
transmit
3 RS232_RXD
Input
Output Data
receive
4 RS232_RTS
Output
Input Handshaking
5 RS232_CTS
Input
Output Handshaking
6
nc or RS232_CTS
Input
Output
Handshaking
7 DGND
Ground Ground Signal Ground/Aux
Ground
8
nc or 4K7 pull up
5V Output
n/a
Aux Power (100mA)
9
NC
No connect
No connect
Reserved
10
NC
No connect
No connect
Reserved
11
NC
No connect
No connect
Reserved
12
NC
No connect
No connect
Reserved
13
NC
No connect
No connect
Reserved
14
NC
No connect
No connect
Reserved
15
NC
No connect
No connect
Reserved
16
NC
No connect
No connect
Reserved
17
NC
No connect
No connect
Reserved
18
NC
No connect
No connect
Reserved
19
NC
No connect
No connect
Reserved
20 RS232_RTS or
4k7pu
Output Input Handshaking
21
NC
No connect
No connect
Reserved
22
NC
No connect
No connect
Reserved
23
NC
No connect
No connect
Reserved
24
NC
No connect
No connect
Reserved
25
INIT
Input
Output
System Reset (active
high)
Table 11: RS-232 DB25 Receptacle (Female)