OPTICAL SYSTEMS DESIGN
DOC ID: 10118201
OSD2139 OPERATOR MANUAL
PAGE 11
2.2.5
CONTACT CLOSURE I/O
The OSD2139 has 2 duplex contact closure channels located on the rear panel via a 15-way DB15
connector. The contact closure inputs (Ch1 Pin2: Ch2 Pin10) is pulled high by an internal 10K resistor.
To operate the contact closure, the input should be switched to ground (see Figure 8). The contact
closure normally open output (CH1 Pin5: Ch2 Pin8) while the common contact is connected to Ch1
Pin12: Ch2 Pin14 of the DB15. Maximum ratings the OSD2139 relay can drive is 120mA @ 350V
(max)
.
Pins 3, 7 and 8 are connected to Ground.
FIGURE 7: DATA AND CONTACT CLOSURE CONNECTIONS
TABLE 3: DATA AND CONTACT CLOSURE CONNECTIONS
Channel
Pin No
Description
Contact Closure CH1
2
CC Input
5
Normally Open Output
12
Common Output
3
Ground
Contact Closure CH2
10
CC Input
8
Normally Open Output
14
Common Output
7
Ground
RS232 CH
15
RS232 Input to OSD2139
6
RS232 Output from OSD2139
RS422/RS485 CH
1
Data + Input to OSD2139
9
Data - Input to oSD2139
4
Data + I/O to/from OSD2139
11
Data - I/O to/from OSD2139
13
Ground
Data/Contact Closure I/O
