OptConnect ema:Play User Manual page 16

J2/J1 Pin Number
1
2
3
4
5
6
7
8
Table 7
The power application header (J4) can be used to control various power functions on ema:Play as well as
ema.
Table 8 summarizes the signals relative to J4.
J4 Pin Number
1
2
3
4
5
6
J2/J1 Signal Name
This signal can be used to supply 4.5V-30V to power the
EXT_VIN
ema:Play/ema platform
Connect this to the external devices' system Ground/return
DGND
(RS232) Connect this to the external devices' RX signal
232TX/A
(RS422/485-2/4) Connect this to the external devices' TXD+ signal
(RS232) Connect this to the external devices' TX signal
232RX/B
(RS422/485-2/4) Connect this to the external devices' TXD- signal
(RS232) Connect this to the external devices' CTS signal
232RTS/Y
(RS422/485-4) Connect this to the external devices' RXD+ signal
(RS232) Connect this to the external devices' RTS signal
232CTS/Z
(RS422/485-4) Connect this to the external devices' RXD- signal
This signal can be monitored by an external device. It is
EMA_RNG
programmable in ema via an AT command
This signal can be monitored by an external device. It will go high
EMA_STS
(IO_VREF) when ema's communication interfaces become ready
J4 Signal Name
4V0 This signal can be used to power external devices (4V @ 1.25A max)
This signal can be used by an external device to remove power from
4VMOD_DIS ema. Drive high (max 5.5V) to disable ema power via load switch
(U6).
3V3 This signal can be used to power external devices (3.3V @ .75A max)
This signal can be used by an external device to disable the onboard
3V3_DIS
3.3V power rail. Drive high (max 5.5V) to disable the 3.3V power rail.
DGND Connect this to the external devices' system Ground/return
This signal can be used by an external device to request an ema
MODEM_RESET reset in the event that ema becomes unresponsive. Drive high (max
5.5V) for a minimum of 1 seconds, then release.
© OptConnect Management, LLC 2020. All rights reserved. Revision 1.0
Usage Example
Usage Example
16